JP5187641B2 - Scanning light measurement device, image display control device, and image display control method - Google Patents

Description

  The present invention relates to an image display control device that controls display of an image by measuring scanning light in an image display device such as a scanning light measuring device and a retinal scanning display device that measures scanning light in a two-dimensional scanning system, The present invention also relates to an image display control method.

  2. Description of the Related Art Conventionally, a see-through type head mounted display configured such that an image by image light based on image information is visually recognized by an observer together with an outside scene by external light is known. One example is a retinal scanning display. The retinal scanning display is mounted in the vicinity of the observer's head, guides image light to the observer's eyes, and scans the observer's retina in a two-dimensional direction so that an image corresponding to the content information is displayed to the observer. It is comprised so that it may be visually recognized by.

  FIG. 14 is a schematic diagram illustrating a configuration of a two-dimensional scanning system of a retinal scanning display disclosed in Patent Document 1. As shown in FIG. 14, the retinal scanning display 201 includes a transmission cable 250, a horizontal scanning unit 260, a relay optical system 270, a vertical scanning unit 280, and a relay optical system 290.

  The transmission cable 250 guides the image light to the horizontal scanning unit 260. The horizontal scanning unit 260 reciprocates the image light in the horizontal direction for image display. The relay optical system 270 is provided between the horizontal scanning unit 260 and the vertical scanning unit 280 and guides the image light scanned by the horizontal scanning unit 260 to the vertical scanning unit 280. The vertical scanning unit 280 reciprocates in the vertical direction the image light scanned in the horizontal direction by the horizontal scanning unit 260. The relay optical system 290 emits image light scanned (two-dimensionally scanned) in the horizontal direction and the vertical direction to the pupil Ea.

  The horizontal scanning unit 260 includes a resonance type deflection element 261 and a horizontal scanning control circuit 262. The resonant deflection element 261 has a reflection surface for scanning the image light in the horizontal direction. The horizontal scanning control circuit 262 resonates the resonance type deflection element 261. The relay optical system 270 relays image light between the horizontal scanning unit 260 and the vertical scanning unit 280. The light scanned in the horizontal direction by the resonance type deflection element 261 is converged on the reflection surface of the deflection element 281 in the vertical scanning unit 280 by the relay optical system 270.

  The vertical scanning unit 280 includes a deflection element 281 and a vertical scanning control circuit 282. The deflection element 281 scans the image light guided by the relay optical system 270 in the vertical direction. The vertical scanning control circuit 282 swings the deflection element 281. The image light scanned in the horizontal direction by the resonance type deflection element 261 and scanned in the vertical direction by the deflection element 281 is emitted to the relay optical system 290 as scanning image light scanned two-dimensionally.

  The relay optical system 290 relays image light between the vertical scanning unit 280 and the wearer's pupil Ea. The image light scanned in the horizontal direction by the resonance type deflection element 261 and scanned in the vertical direction by the deflection element 281 is converged on the pupil Ea of the wearer by the relay optical system 290. In this way, the wearer can visually recognize an image corresponding to the image information.

JP 2007-256419 A

  In the retinal scanning display disclosed in Patent Document 1, when the scanning direction of the image light by the horizontal scanning unit 260 and the scanning direction of the image light by the vertical scanning unit 280 are not orthogonal, the image quality of the image visually recognized by the wearer Will fall. Therefore, it is necessary to determine whether or not the horizontal scanning direction of the image light by the horizontal scanning unit 260 and the vertical scanning direction of the image light by the vertical scanning unit 280 are orthogonal by measuring the scanning light. However, in a two-dimensional scanning system represented by the retinal scanning display disclosed in Patent Document 1, scanning light for determining whether the horizontal scanning direction and the vertical scanning direction of image light are orthogonal to each other The measurement method has not been established so far, and there has been a problem that the image quality of the image in the retinal scanning display cannot be maintained above a certain level.

  The present invention has been made to solve the above-described problems. In an image display apparatus such as a retinal scanning display apparatus, the horizontal scanning direction and the vertical scanning direction of image light are accurately adjusted so as to maintain the image quality. In order to obtain a good orthogonality, the scanning light is measured, and the positional relationship between the two scanning directions in the two-dimensional scanning system can be accurately obtained. An object of the present invention is to provide an image display control apparatus and an image display control method for controlling the image.

  In order to achieve the above object, according to the present invention, there is provided a scanning light measuring device for measuring a scanned beam, an imaging unit for imaging a scanned beam in a predetermined imaging range set in advance. A first calculation unit that calculates an inclination of the beam scanned in the first direction within the imaging range from an output signal of the imaging unit when a beam scanned in the first direction is captured by the imaging unit; A second calculation unit that calculates an inclination of the beam scanned in the second direction within the imaging range from an output signal of the imaging unit when the beam scanned in the second direction is captured by the imaging unit; An angle calculation unit that calculates an angle between the first direction and the second direction from the inclination calculated by the first calculation unit and the inclination calculated by the second calculation unit. Features It is intended to.

  According to a second aspect of the present invention, in the first aspect of the invention, the imaging unit is disposed in a first imaging reference direction of the imaging range and a second imaging reference direction orthogonal to the first imaging reference direction. And having a plurality of light receiving elements for detecting the intensity of the beam scanned within the imaging range, wherein the first calculator is configured to detect the beam scanned in the first direction detected by the plurality of light receiving elements. A point at a predetermined position between two first positions in the first imaging reference direction having a predetermined first intensity in the first intensity distribution in the first imaging reference direction of intensity is determined as a first feature point; Calculating an inclination within the imaging range of a beam scanned in the first direction from an inclination of an approximate first linear function connecting the plurality of first feature points determined in the first imaging reference direction; The second calculation unit Two second in the second imaging reference direction having a predetermined second intensity in the second intensity distribution in the second imaging reference direction of the intensity of the beam scanned in the second direction detected by the plurality of light receiving elements. A point at a predetermined position between the positions is determined as a second feature point, and the second characteristic point is determined based on an inclination of an approximate second linear function connecting the plurality of second feature points determined in the second imaging reference direction. The inclination in the imaging range of the beam scanned in the direction is calculated.

  A third aspect of the present invention includes a first scanning unit that reflects an incident beam and scans in the first direction, and a second scanning unit that reflects the incident beam and scans in the second direction. In the image display control device, an imaging unit that captures a scanned beam in a predetermined imaging range that is set in advance, and the imaging unit when the beam scanned in the first direction is captured by the imaging unit A first calculation unit that calculates an inclination of a beam scanned in the first direction within the imaging range from the output signal of the imaging unit, and the imaging unit when the beam scanned in the second direction is imaged by the imaging unit A second calculation unit that calculates an inclination of the beam scanned in the second direction within the imaging range, an inclination calculated by the first calculation unit, and an inclination calculated by the second calculation unit From the first one And an angle calculation unit that calculates an angle between the second direction and a control unit that controls at least one of the scanning units so that the angle calculated by the angle calculation unit is a right angle; It is characterized by providing.

  According to a fourth aspect of the present invention, in the invention according to the third aspect, the imaging unit is disposed in a first imaging reference direction of the imaging range and a second imaging reference direction orthogonal to the first imaging reference direction. And having a plurality of light receiving elements for detecting the intensity of the beam scanned within the imaging range, wherein the first calculator is configured to detect the beam scanned in the first direction detected by the plurality of light receiving elements. A point at a predetermined position between two first positions in the first imaging reference direction having a predetermined first intensity in the first intensity distribution in the first imaging reference direction of intensity is determined as a first feature point; Calculating an inclination within the imaging range of a beam scanned in the first direction from an inclination of an approximate first linear function connecting the plurality of first feature points determined in the first imaging reference direction; The second calculation unit Two second in the second imaging reference direction having a predetermined second intensity in the second intensity distribution in the second imaging reference direction of the intensity of the beam scanned in the second direction detected by the plurality of light receiving elements. A point at a predetermined position between the positions is determined as a second feature point, and the second characteristic point is determined based on an inclination of an approximate second linear function connecting the plurality of second feature points determined in the second imaging reference direction. The inclination in the imaging range of the beam scanned in the direction is calculated.

  The present invention according to claim 5 includes a first scanning unit that reflects an incident beam and scans in the first direction, and a second scanning unit that reflects the incident beam and scans in the second direction. In the image display control method used for the image display device, an imaging step for imaging a scanned beam in a predetermined imaging range set in advance, and a beam scanned in the first direction are imaged by the imaging step. A first calculation step for calculating an inclination of a beam scanned in the first direction within the imaging range from a signal indicating an imaging result of the imaging step, and a beam scanned in the second direction in the imaging step. A second calculation step of calculating the inclination of the beam scanned in the second direction within the imaging range from the signal indicating the imaging result of the imaging step when captured by the imaging step; An angle calculating step for calculating an angle between the first direction and the second direction from the inclination calculated by the first calculating step and the inclination calculated by the second calculating step, and the angle calculating step And a control step of controlling at least one of the scanning units so that the calculated angle is a right angle.

  According to a sixth aspect of the present invention, in the invention according to the fifth aspect, the imaging step includes the intensity of any one of the beam scanned in the first direction and the beam scanned in the second direction. An intensity detecting step for detecting the intensity, and the first calculating step has a predetermined intensity distribution in the first imaging reference direction of the intensity of the beam scanned in the first direction detected by the intensity detecting step. A point at a predetermined position between two first positions in the first imaging reference direction having the first intensity is determined as a first feature point, and the plurality of first characteristics determined in the first imaging reference direction are determined. An inclination in the imaging range of the beam scanned in the first direction is calculated from an inclination of an approximate first linear function connecting points, and the second calculation step is detected by the intensity detection step. Further, two second in the second imaging reference direction having a predetermined second intensity in the second intensity distribution in the second imaging reference direction orthogonal to the first imaging reference direction of the intensity of the beam scanned in the second direction. A point at a predetermined position between two positions is determined as a second feature point, and the second feature point is determined based on an inclination of an approximate second linear function connecting the plurality of second feature points determined in the second imaging reference direction. The inclination in the imaging range of the beam scanned in two directions is calculated.

  According to the scanning light measurement device of claim 1, the angle calculation unit determines between the first direction and the second direction from the inclination calculated by the first calculation unit and the inclination calculated by the second calculation unit. The angle can be calculated. Therefore, the positional relationship between the two scanning directions in the two-dimensional scanning system can be obtained with high accuracy.

  According to the scanning light measuring apparatus of claim 2, the first feature point and the second feature point are respectively determined from the first intensity distribution in the first imaging reference direction and the second intensity distribution in the second imaging reference direction. Then, the inclination of the beam scanned in the first direction and the inclination of the beam scanned in the second direction within the imaging range are calculated. Therefore, the angle between the first direction and the second direction can be calculated with high accuracy, and the positional relationship between the two scanning directions in the two-dimensional scanning system can be determined with high accuracy.

  According to the image display control device of the third aspect, the angle calculation unit between the first direction and the second direction is calculated from the inclination calculated by the first calculation unit and the inclination calculated by the second calculation unit. The angle can be calculated. Then, at least one of the scanning units is controlled so that the angle calculated by the angle calculating unit becomes a right angle. Therefore, when the image display control device is used in an image display device such as a retinal scanning display device, the horizontal scanning direction and the vertical scanning direction of image light can be accurately orthogonalized, and image quality can be maintained. it can.

  According to the image display control device of the fourth aspect, the first feature point and the second feature point are respectively determined from the first intensity distribution in the first imaging reference direction and the second intensity distribution in the second imaging reference direction. The inclination of the beam scanned in the first direction within the imaging range and the inclination of the beam scanned in the second direction are calculated. Therefore, the angle between the first direction and the second direction can be calculated with high accuracy, and the positional relationship between the two scanning directions in the two-dimensional scanning system can be determined with high accuracy. Therefore, when the image display control device is used in an image display device such as a retinal scanning display device, the horizontal scanning direction and the vertical scanning direction of image light can be accurately orthogonalized, and image quality can be maintained. it can.

  According to the image display control method of the fifth aspect, from the inclination calculated by the first calculation step and the inclination calculated by the second calculation step, between the first direction and the second direction by the angle calculation step. The angle can be calculated. Then, at least one of the scanning units is controlled so that the angle calculated in the angle calculating step is a right angle. Therefore, when the image display control method is used for an image display device such as a retinal scanning display device, the horizontal scanning direction and the vertical scanning direction of the image light can be accurately orthogonalized, and the image quality of the image can be maintained. it can.

  According to the image display control method of the sixth aspect, the first feature point and the second feature point are respectively determined from the first intensity distribution in the first imaging reference direction and the second intensity distribution in the second imaging reference direction. The inclination of the beam scanned in the first direction within the imaging range and the inclination of the beam scanned in the second direction are calculated. Therefore, the angle between the first direction and the second direction can be calculated with high accuracy, and the positional relationship between the two scanning directions in the two-dimensional scanning system can be determined with high accuracy. Therefore, when the image display control method is used in an image display device such as a retinal scanning display device, the horizontal scanning direction and the vertical scanning direction of the image light can be accurately orthogonalized, and the image quality of the image can be maintained. it can.

It is a top view which shows the external appearance of the image display control apparatus 1 which concerns on one Embodiment of this invention. It is a perspective view which shows the external appearance of the 1st scanning part 4 which concerns on this embodiment. It is explanatory drawing for demonstrating the scanning of the beam BM by the 2nd scanning part 5 which concerns on this embodiment. It is explanatory drawing for demonstrating the structure of the imaging part 6 which concerns on this embodiment. It is a side view which shows the external appearance of the scanning position adjustment part 8 which concerns on this embodiment. It is a figure which shows the electrical constitution of the said image display control apparatus. It is a flowchart which shows the process from step S1 in a main process to step S6. It is a flowchart which shows the process from step S7 to step S13 in a main process. It is a flowchart which shows the process of step S5 shown in FIG. It is a flowchart which shows the process of step S11 shown in FIG. It is a figure which cuts out and shows a part of imaging range IA in order to demonstrate the inclination calculation process of the beam BM within the imaging range IA by the 1st calculation part 71. FIG. It is a figure which cuts out and shows a part of imaging range IA in order to demonstrate the inclination calculation process of the beam BM within the imaging range IA by the 2nd calculation part 72. FIG. It is a figure which shows the movement in the imaging range IA of beam BM when the 2nd scanning part 5 is moved to (alpha) direction by the scanning position adjustment part 8. FIG. It is a figure which shows the movement in the imaging range IA of the beam BM when the 2nd scanning part 5 is moved to (beta) direction by the scanning position adjustment part 8. FIG. It is a figure which shows the movement in the imaging range IA of beam BM when the 2nd scanning part 5 is moved to (gamma) direction by the scanning position adjustment part 8. FIG. Explanation for explaining the correspondence between the movement of the second scanning unit 5 in the β direction by the scanning position adjusting unit 8 and the movement of the captured image SI of the beam BM in the imaging range IA when the second scanning unit 5 is moved. FIG. It is a figure which shows distribution of the light intensity INT with respect to the position SDX in the horizontal direction SD of the beam BM scanned by the 1st direction DF. It is a block diagram which shows the structure of the two-dimensional scanning system of a retinal scanning display.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[Appearance]
FIG. 1 is a top view showing an appearance of the image display control apparatus 1 of the present embodiment. As shown in FIG. 1, the image display control device 1 includes a measurement unit 2 and a processing unit 3. The measurement unit 2 includes a first scanning unit 4, a second scanning unit 5, an imaging unit 6, a calculation unit 7, a scanning position adjustment unit 8, an imaging position adjustment unit 9, and a work 10. The processing unit 3 is connected to the first scanning unit 4, the second scanning unit 5, the imaging unit 6, the calculation unit 7, the scanning position adjustment unit 8, and the imaging position adjustment unit 9. The image display control device 1 in the present embodiment is an example of the image display control device of the present invention. The measurement unit 2 in the present embodiment is an example of the scanning light measurement device of the present invention.

  The first scanning unit 4 and the second scanning unit 5 are each configured by an optical scanning device as shown in FIGS. 2A and 2B. As shown in FIG. 2A, the first scanning unit 4 includes a reflection mirror unit 41, a beam 42, and a drive unit 43. The reflection mirror unit 41 can reflect the incident beam BM as shown in FIG. 2A. The beam 42 is connected to the reflection mirror section 41 as shown in FIG. 2A. The drive unit 43 is provided on the beam 42. The drive unit 43 includes a piezoelectric body. The drive unit 43 is driven by supplying a drive signal having a periodically changing voltage to the piezoelectric body of the drive unit 43. By driving the drive unit 43, the beam 42 is vibrated around the swing axis AX1. As the beam 42 vibrates around the swing axis AX1, the reflection mirror 41 connected to the beam 42 swings around the swing axis AX1. In this way, as the reflection mirror unit 41 swings, the first scanning unit 4 reflects the beam BM incident on the reflection surface 41A of the reflection mirror unit 41 and scans in the first direction. As shown in FIG. 2B, the second scanning unit 5 includes a reflection mirror unit 51 as in the first scanning unit 4. The second scanning unit 5 is driven in the same manner as the first scanning unit 4. When the second scanning unit 5 is driven, the reflection mirror unit 51 is swung around the swing axis AX2. When the reflection mirror unit 51 is swung around the swing axis AX2, the reflection mirror unit 51 reflects the beam BM incident on the reflection surface 51A and scans in the second direction. As shown in FIGS. 1 and 2B, hereinafter, the direction parallel to the swing axis AX2 is the Z axis, the direction parallel to the reflecting surface 51A of the reflecting mirror 51 and the direction perpendicular to the Z axis is X A direction perpendicular to the axis and the reflecting surface 51A is taken as a Y axis. Further, as shown in FIG. 2B, the rotation direction in which the X axis is the rotation axis is the α direction, the rotation direction in which the Y axis is the rotation axis is the β direction, and the rotation direction in which the Z axis is the rotation axis is the γ direction. To do.

  As shown in FIG. 1, the beam BM is emitted from a light source provided outside the image display control device 1, and passes through an optical fiber FB provided outside the image display control device 1, a collimating optical system CL, and the like. And supplied to the first scanning unit 4. The beam BM supplied to the first scanning unit 4 is a parallel light beam that has been collimated by the collimating optical system CL. The beam BM has a beam diameter as shown in FIGS. 2A and 2B. The beam BM supplied to the first scanning unit 4 is reflected by the first scanning unit 4. The beam BM reflected by the first scanning unit 4 is supplied to the second scanning unit 5. The beam BM supplied to the second scanning unit 5 is reflected by the second scanning unit 5. The beam BM reflected by the second scanning unit 5 is supplied to the imaging unit 6. The center line of the beam BM is supplied to the center CT of the reflection mirror unit 41 of the first scanning unit 4, and the first scanning unit 4 and the second scanning unit 5 are in an optically conjugate positional relationship. Has been placed. Therefore, even when one of the first scanning unit 4 and the second scanning unit 5 is driven and the beam BM is scanned by any one of the scanning units, the center line CB of the beam BM is scanned by the first scanning. It passes through the center of each reflection mirror part of the part 4 and the second scanning part 5.

  The imaging unit 6 images the supplied beam BM within the imaging range IA. As shown in FIG. 3, the imaging unit 6 includes a CCD including a plurality of light receiving elements LR arranged in the vertical direction LD and the horizontal direction SD in the imaging range IA. The imaging unit 6 can detect the intensity and position of the incident beam BM. Since the imaging unit 6 is configured by a CCD including a plurality of light receiving elements LR, it is possible to capture a wide range of the beam BM scanned by either the first scanning unit 4 or the second scanning unit 5. Become. The calculation unit 7 is connected to the imaging unit 6. The calculation unit 7 calculates the inclination of the light beam scanned in the first direction and the second direction and the angle between the first direction and the second direction from the light beam imaged by the imaging unit 6. The 1st scanning part 4 in this embodiment is an example of the 1st scanning part of this invention. The 2nd scanning part 5 in this embodiment is an example of the 2nd scanning part of this invention. The imaging unit 6 in the present embodiment is an example of the imaging unit of the present invention. The light receiving element LR in the present embodiment is an example of the light receiving element of the present invention.

  As shown in FIG. 4, the scanning position adjustment unit 8 includes a gripping unit 8 </ b> A and a position adjustment unit 8 </ b> B, and is fixed to the device frame of the image display control device 1. The gripping unit 8A grips the second scanning unit 5. The position adjustment unit 8B is connected to the gripping unit 8A. The position adjustment unit 8B can move the gripping unit 8A in the six-axis directions of the X-axis direction, the Y-axis direction, the Z-axis direction, the α direction, the β direction, and the γ direction. When the position adjusting unit 8B moves the gripping unit 8A in the six-axis direction, the second scanning unit 5 gripped by the gripping unit 8A is moved in the six-axis direction. Similarly, the imaging position adjustment unit 9 is connected to the imaging unit 6 and can move the imaging unit 6 to the XX axis, the YY axis, and the ZZ axis that are the three axis directions of the imaging unit 6 illustrated in FIG.

  The work 10 fixes the first scanning unit 4 and supports the second scanning unit 5 so that the position thereof can be adjusted. The workpiece 10 is fixed to the device frame of the image display control device 1.

[Electrical configuration]
The electrical configuration of the image display control apparatus 1 according to the present embodiment will be described with reference to FIG. In FIG. 5, a solid line with an arrow indicates an electrical connection. In FIG. 5, a solid line without an arrow indicates a mechanical connection as shown in FIG. As shown in FIG. 5, the processing unit 3 includes an imaging position control unit 31, a scanning position control unit 32, and a drive control unit 33. As shown in FIG. 5, the calculation unit 7 includes a first calculation unit 71, a second calculation unit 72, and an angle calculation unit 73. The processing unit 3 and the calculation unit 7 are configured by a computer including a CPU, a ROM, a RAM, and the like.

  The imaging position control unit 31 receives information regarding the intensity of the imaged beam BM and the position of the imaging unit 6 within the imaging range from the imaging unit 6. The imaging position control unit 31 supplies an adjustment command signal to the imaging position adjustment unit 9 when the beam BM scanned by the first scanning unit 4 or the second scanning unit 5 does not enter the imaging range. The imaging position adjustment unit 9 adjusts the position of the imaging unit 6 based on the supplied adjustment command signal. In this way, by adjusting the position of the imaging unit 6, the beam BM scanned by the first scanning unit 4 or the second scanning unit 5 surely enters the imaging range IA.

  The first calculation unit 71 receives information about the intensity of the beam BM scanned by the first scanning unit 4 and the position of the imaging unit 6 in the imaging range IA from the imaging unit 6. The first calculator 71 calculates the inclination of the beam BM scanned by the first scanner 4 within the imaging range IA from the received information. The second calculation unit 72 receives information regarding the intensity of the beam BM scanned by the second scanning unit 5 and the position of the imaging unit 6 in the imaging range IA from the imaging unit 6. The second calculator 72 calculates the inclination of the beam BM scanned by the second scanner 5 within the imaging range IA from the received information. The angle calculation unit 73 calculates an angle between the first direction and the second direction in the imaging range IA from the inclination calculated by the first calculation unit 71 and the inclination calculated by the second calculation unit 72. The 1st calculation part 71 in this embodiment is an example of the 1st calculation part of this invention. The 2nd calculation part 72 in this embodiment is an example of the 2nd calculation part of this invention. The angle calculation unit 73 in the present embodiment is an example of the angle calculation unit of the present invention.

  The scanning position control unit 32 supplies a predetermined adjustment signal to the scanning position adjustment unit 8 based on the angle between the first direction and the second direction calculated by the angle calculation unit 73. The scanning position adjustment unit 8 is driven based on the supplied adjustment signal. By driving the scanning position adjusting unit 8, the position of the second scanning unit 5 is adjusted. The scanning position adjustment unit 8 and the scanning position control unit 32 in the present embodiment are examples of the control unit of the present invention.

  The drive control unit 33 supplies a drive signal to any one of the first scanning unit 4 and the second scanning unit 5. Any one of the first scanning unit 4 and the second scanning unit 5 is driven based on the supplied driving signal. As the driving unit of the first scanning unit 4 and the driving unit of the second scanning unit 5 are driven, the first scanning unit 4 and the second scanning unit 5 are as shown in FIGS. 2A and 2B. In each case, the incident beam BM is reflected and scanned.

[Operation control]
Next, operation control of the image display control apparatus 1 will be described with reference to the drawings. 6 and 7 are flowcharts showing the operation control of the image display control apparatus 1. A series of operation control is executed by the CPU of the processing unit 3 or the calculation unit 7.

  The process shown in FIG. 6 starts when the user turns on an image display control switch provided in the image display control apparatus 1, and first, the first scanning unit 4 is driven (step S1, hereinafter referred to as S1). ). At this time, the second scanning unit 5 is stopped. The beam BM is scanned by the first scanning unit 4 and then reflected by the reflection mirror unit of the second scanning unit 5. The beam BM reflected by the reflection mirror unit of the second scanning unit 5 is imaged by the imaging unit 6 (S2). In S <b> 2, the beam BM is imaged by the imaging unit 6, whereby the intensity of the beam BM is detected. Step S2 in the present embodiment is an example of an imaging step and an intensity detection step of the present invention.

  When the beam BM is imaged, the imaging position control unit 31 determines whether or not the beam BM is within the imaging range IA (S3). Specifically, when the beam BM is detected by a predetermined number or more of the light receiving elements LR in the imaging range IA of the imaging unit 6, it is determined that the beam BM is within the imaging range IA. The When the beam BM is detected by less than a predetermined number of the light receiving elements LR in the imaging range IA of the imaging unit 6, it is determined that the beam BM is not within the imaging range IA.

  When it is determined that the beam BM is not within the imaging range IA (S3: No), the imaging unit 6 adjusts the position of the imaging unit 6 in the three axis directions of the XX axis, the YY axis, and the ZZ axis. (S4). When the position of the imaging unit 6 is adjusted, the process proceeds to S2 and the beam BM is imaged. If it is determined in S3 that the beam BM is within the imaging range IA (S3: Yes), the position adjustment of the imaging unit 6 is terminated, and the position of the imaging unit 6 is determined. In this way, the position of the imaging unit 6 is adjusted until it is determined that the beam BM is within the imaging range IA, so that the beam BM is reliably within the imaging range IA.

  When the position of the imaging unit 6 is determined, the first calculation unit 71 calculates the inclination of the beam BM within the imaging range IA (S5). FIG. 8 is a flowchart showing the beam BM tilt calculation processing by the first calculation unit 71 in S5. FIG. 10 is a diagram illustrating a captured image FI in a partial range of the imaging range IA of the beam BM scanned in the first direction DF by the first scanning unit 4 and captured by the imaging unit 6. In the inclination calculation process shown in FIG. 8, as shown in FIG. 10, first, the positions 1SA, 2SA,..., MSA and the positions 1SB, 2SB,. (SA1). Here, the integer M is the number of light receiving elements LR that the imaging unit 6 has in the vertical direction LD within the imaging range IA. FIG. 10 is an enlarged view showing a part of the imaging range IA, and the integer J is an arbitrary integer in the range from 1 to the integer M. When the positions 1SA, 2SA, ..., MSA and the positions 1SB, 2SB, ..., MSB are determined, the feature points 1SC, 2SC, ..., MSC in the lateral direction SD are determined (SA2). When the feature points 1SC, 2SC,..., MSC in the lateral direction SD are determined, an approximate linear function gradient GS connecting the feature points 1SC, 2SC,. As a matter of course, the expression “connecting feature points” does not mean that an approximate linear function strictly passes through all feature points. When the approximate slope GS of the linear function is calculated, the calculated slope GS of the linear function is determined as the slope GS within the imaging range IA of the beam BM. As described above, the inclination GS of the beam BM within the imaging range IA is calculated (SA3). Step S5 in the present embodiment is an example of a first calculation step of the present invention. The first direction DF in the present embodiment is an example of the first direction in the present invention. The horizontal direction SD in the present embodiment is an example of the first imaging reference direction in the present invention.

  When the slope GS of the beam BM is calculated in S5 shown in FIG. 6, the first scanning unit 4 is stopped (S6). If the 1st scanning part 4 is stopped in S6 shown in FIG. 6, a process will transfer to S7 shown in FIG. 7, and the 2nd scanning part 5 will be driven (S7). When the second scanning unit 5 is driven, the beam BM is reflected by the first scanning unit 4 and then scanned by the reflection mirror unit of the second scanning unit 5. The beam BM scanned by the reflection mirror unit of the second scanning unit 5 is imaged by the imaging unit 6 (S8).

  When the beam BM is imaged, the imaging position control unit 31 determines whether or not the beam BM is within the imaging range IA (S9). Specifically, when the beam BM is detected by a predetermined number or more of the light receiving elements LR in the imaging range IA of the imaging unit 6, it is determined that the beam BM is within the imaging range IA. The When the beam BM is detected by less than a predetermined number of the light receiving elements LR in the imaging range IA of the imaging unit 6, it is determined that the beam BM is not within the imaging range IA.

  If it is determined that the beam BM is not within the imaging range IA (S9: No), the position of the imaging unit 6 is adjusted by the imaging position adjustment unit 9 (S10). When the position of the imaging unit 6 is adjusted, the process proceeds to S8, and the beam BM is imaged. In S9, when it is determined that the beam BM is within the imaging range IA (S9: Yes), the position adjustment of the imaging unit 6 is finished, and the position of the imaging unit 6 is determined. In this way, the position of the imaging unit 6 is adjusted until it is determined that the beam BM is within the imaging range IA, so that the beam BM is reliably within the imaging range IA.

  When the position of the imaging unit 6 is determined, the second calculation unit 72 calculates the inclination of the beam BM within the imaging range IA (S11). FIG. 9 is a flowchart showing the beam BM tilt calculation processing by the second calculation unit 72 in S11. FIG. 11 is a diagram illustrating a captured image SI in a partial range of the imaging range IA of the beam BM scanned in the second direction DS by the second scanning unit 5 and imaged by the imaging unit 6. In the inclination calculation process shown in FIG. 9, as shown in FIG. 11, first, the positions 1LA, 2LA,..., NLA and the positions 1LB, 2LB,. (SB1). Here, the integer N is the number of light receiving elements LR that the imaging unit 6 has in the horizontal direction SD within the imaging range IA. FIG. 11 is an enlarged view of a part of the imaging range IA, and the integer K is an arbitrary integer in the range from 1 to the integer N. When the positions 1LA, 2LA, ..., NLA and the positions 1LB, 2LB, ..., NLB are determined, the feature points 1LC, 2LC, ..., NLC in the vertical direction LD are determined (SB2). When the feature points 1LC, 2LC,..., NLC in the vertical direction LD are determined, an approximate linear function gradient GL connecting the feature points 1LC, 2LC,. As a matter of course, the expression “connecting feature points” does not mean that an approximate linear function strictly passes through all feature points. When the approximate slope GL of the linear function is calculated, the calculated slope GL of the linear function is determined as the slope GL within the imaging range IA of the beam BM. As described above, the inclination GL of the beam BM within the imaging range IA is calculated (SB3). Step S11 in the present embodiment is an example of a second calculation step of the present invention. The second direction DS in the present embodiment is an example of the second direction in the present invention. The vertical direction LD in the present embodiment is an example of the second imaging reference direction in the present invention.

  When the inclination GL of the beam BM is calculated in S11 shown in FIG. 7, the angle calculation unit 73 captures an image from the inclination GS calculated by the first calculation unit 71 and the inclination GL calculated by the second calculation unit 72. An angle between the first direction and the second direction within the range IA is calculated (S12). When the angle is calculated, it is determined whether or not the angle calculated by the scanning position control unit 32 is a value within a predetermined angle range 90 ± 0.167 degrees (S13). When it is determined that the calculated angle is not a value within the predetermined angle range (S13: No), the position of the second scanning unit 5 is adjusted by the scanning position adjusting unit 8 (S14). Step S12 in this embodiment is an example of the angle calculation step of the present invention. Steps S13 and S14 in this embodiment are an example of the control step of the present invention.

  The position adjustment processing of the second scanning unit 5 by the scanning position adjusting unit 8 in S14 will be described in detail with reference to FIGS. 12A, 12B, and 12C. The scanning position adjustment unit 8 is arranged in the X-axis direction, the Y-axis direction, the Z-axis direction, the α direction around the X axis, the β direction around the Y axis, and the γ direction around the Z axis shown in FIGS. The second scanning unit 5 can be moved in six axis directions.

  12A, 12B, and 12C, the movement of the second scanning unit 5 by the scanning position adjusting unit 8 and the captured image SI of the beam BM when the second scanning unit 5 is moved within the imaging range IA. The correspondence with movement will be described. 12A, 12B, and 12C, each of the captured image BI and the captured image AI is scanned in the second direction DS by the second scanning unit 5 illustrated in FIG. This is a captured image SI in a part of the BM imaging range IA. 12A and 12C, the second direction DS indicated by a solid line with a bidirectional arrow indicates the scanning direction of the beam BM by the second scanning unit 5 before and after the second scanning unit 5 is adjusted in position. In FIG. 12B, a second direction DS indicated by a two-dot chain line with a bidirectional arrow indicates a scanning direction of the beam BM by the second scanning unit 5 before the second scanning unit 5 is adjusted in position. In FIG. 12B, a second direction DS indicated by a solid line with a bidirectional arrow indicates the scanning direction of the beam BM by the second scanning unit 5 after the position of the second scanning unit 5 is adjusted.

  FIG. 12A is a diagram illustrating movement of the beam BM in the imaging range IA when the second scanning unit 5 is moved in the α direction by the scanning position adjusting unit 8. As shown in FIG. 12A, when the second scanning unit 5 is moved in the α direction, the beam BM moves from the position of the captured image BI indicated by the two-dot chain line to the captured image AI indicated by the solid line within the imaging range IA. It is moved in the vertical direction LD like movement to a position.

  FIG. 12B is a diagram illustrating movement of the beam BM in the imaging range IA when the second scanning unit 5 is moved in the β direction by the scanning position adjusting unit 8. As shown in FIG. 12B, when the second scanning unit 5 is moved in the β direction, the beam BM moves from the position of the captured image BI indicated by the two-dot chain line to the captured image AI indicated by the solid line within the imaging range IA. It is rotated like a movement to a position.

  FIG. 12C is a diagram illustrating movement of the beam BM in the imaging range IA when the second scanning unit 5 is moved in the γ direction by the scanning position adjusting unit 8. When the second scanning unit 5 is moved in the γ direction as shown in FIG. 12C, the beam BM moves from the position of the captured image BI indicated by the two-dot chain line to the captured image AI indicated by the solid line within the imaging range IA. It is moved in the horizontal direction SD like movement to a position.

  To summarize FIGS. 12A, 12B, and 12C, in this embodiment, in order to make the first direction DF and the second direction DS orthogonal, the rotational movement within the imaging range IA as shown in FIG. 12B. Need to be done. Therefore, in the position adjustment process of the second scanning unit 5 by the scanning position adjusting unit 8, the second scanning unit 5 is mainly moved in the β direction. However, in order to complete the position adjustment process of the second scanning unit 5 only by moving the second scanning unit 5 in the β direction as described above, the second configuration as shown in FIGS. 1 and 2B is required. It is necessary that the coordinate system of the scanning unit 5 and the coordinate system of the scanning position adjustment unit 8 completely coincide. Therefore, when there is a possibility that the coordinate system of the second scanning unit 5 and the coordinate system of the scanning position adjusting unit 8 are slightly shifted, the scanning position adjusting unit 8 not only moves in the β direction but also moves in the X axis direction. , Movement in the Y-axis direction, Z-axis direction, α-direction, and γ-direction also needs to be performed. As described above, the second scanning unit 5 is finely moved in the six-axis directions by the scanning position adjusting unit 8, so that the first direction and the second direction can be reliably orthogonal to each other.

  The movement of the second scanning unit 5 in the β direction by the scanning position adjusting unit 8 will be described in more detail with reference to FIG. 12D. In FIG. 12D, a first direction DF indicated by a solid line with a bidirectional arrow indicates the scanning direction of the beam BM by the first scanning unit 4 in S1 shown in FIG. In FIG. 12D, a second direction DS indicated by a two-dot chain line with a bidirectional arrow indicates a scanning direction of the beam BM by the second scanning unit 5 before the second scanning unit 5 is adjusted in position. In FIG. 12D, a second direction DS indicated by a solid line with a bidirectional arrow indicates the scanning direction of the beam BM by the second scanning unit 5 after the position of the second scanning unit 5 is adjusted. In FIG. 12D, the captured image FI indicates a captured image in a partial range of the imaging range IA of the beam BM scanned in the first direction DF by the first scanning unit 4 and captured by the imaging unit 6 in S2. The captured image BI and the captured image AI are both scanned in the second direction DS by the second scanning unit 5, and captured images in a part of the imaging range IA of the beam BM captured by the imaging unit 6 in S8. Show. As shown in FIG. 12D, the captured image FI and the captured images BI and AI are not necessarily captured in the same range within the imaging range IA. Further, since the scanning range exists in the first scanning unit 4 and the second scanning unit 5, as shown in FIG. 12D, when the captured image FI and the captured images BI and AI intersect each other in the imaging range IA. Is not limited. However, since the position of the imaged beam BM is sequentially stored in the RAM of the processing unit 3, the angle between the first direction and the second direction within the imaging range is calculated even in the above case. It is possible to do.

  As shown in FIG. 12D, when the captured image FI and the captured image BI are not substantially orthogonal, that is, the angle calculated in S13 shown in FIG. 7 is a value within a predetermined angular range 90 ± 0.167 degrees. If it is determined that it is not, the position of the second scanning unit 5 is adjusted by the scanning position adjusting unit 8 in S14. At the time of this adjustment, when the second scanning unit 5 is moved in the β direction by the scanning position adjusting unit 8, the beam BM is imaged as indicated by a two-dot chain line within the imaging range IA as shown in FIG. 12D. It is rotated and moved like a movement from the position of the image BI to the position of the captured image AI indicated by the solid line. As described above, the beam BM is rotated within the imaging range AI, so that the captured image FI and the captured image AI can be orthogonalized. That is, the first direction DF and the second direction DS can be orthogonal.

  When the position of the second scanning unit 5 is adjusted, the process proceeds to S11, and the inclination GL of the beam BM is calculated. If it is determined in S13 that the calculated angle is a value within a predetermined angle range (S13: Yes), the position of the second scanning unit 5 is determined. When the position of the second scanning unit 5 is determined, the image display control switch is turned off, and the process ends.

[Example of use]
The image display control apparatus 1 according to the present embodiment can be applied to an image display apparatus such as a retinal scanning display or a laser printer. By using the image display control device 1 in these devices, the image quality of the image can be kept above a certain level.

(Modification)
In this embodiment, the beam BM scanned in the first direction DF has positions 1SA, 2SA,..., MSA and positions 1SB, 2SB,. The feature points 1SC, 2SC,..., MSC in the horizontal direction SD are determined from the determined position, and the gradient GS of the beam BM in the imaging range IA is calculated from the determined feature points by the least square method. The inclination GL of the beam BM scanned in the second direction DS within the imaging range IA was calculated in the same manner. This calculation method is particularly effective when the beam BM is a so-called Gaussian beam and exhibits a Gaussian light intensity distribution as shown in FIG. FIG. 13 is a diagram illustrating the distribution of the light intensity INT with respect to the position SDX in the lateral direction SD of the beam BM scanned in the first direction DF. In the present embodiment, first, a position SX having a predetermined intensity ITY shown in FIG. 13 and a position SY are determined. Then, an intermediate position SIM between the position SX and the position SY is determined as a feature point. When the beam BM is a Gaussian beam, the intensity IMX of the beam BM at the intermediate position SI determined as the feature point substantially matches the maximum value of the intensity of the beam BM. Therefore, it can be said that the intermediate position SIM determined as the feature point is suitable as a point indicating the feature of the beam BM. In the present embodiment, the feature points are determined and the inclination in the imaging range of the beam is calculated in this way. However, the present invention is not limited to this. For example, the position where the intensity of the longitudinal beam is simply the highest is determined. The inclination in the imaging range of the beam may be calculated from the determined feature point.

  In this embodiment, as shown in FIGS. 10 and 11, the first scanning unit 4 performs vertical scanning of the beam BM, and the second scanning unit 5 performs horizontal scanning of the beam BM. However, the present invention is not limited to this, and the first scanning unit may perform horizontal scanning and the second scanning unit may perform vertical scanning. In this case, the processing corresponding to SA1 to SA3 in the present embodiment is processing for calculating the inclination of the luminous flux by determining the feature points in the vertical direction, and the processing corresponding to SB1 to SB3 is the feature in the horizontal direction. This is a process for calculating the inclination of the luminous flux by determining the point.

  In the present embodiment, the first scanning unit 4 is driven by a piezoelectric driving method in which a piezoelectric body is used for the driving unit 43. However, the present invention is not limited to this, for example, a drive signal of a periodically changing current is supplied to a coil provided on the back side of the reflection mirror, and a magnetic field supplied from one of the reflection mirrors to the other and a current supplied to the coil The first scanning unit may be driven by a known moving coil type electromagnetic drive in which the reflection mirror is swung by the interaction with the first scanning unit. The second scanning unit may also be driven by either piezoelectric driving or electromagnetic driving. Further, for example, the first scanning unit and the second scanning unit may have different driving methods such that the first scanning unit is piezoelectrically driven and the second scanning unit is electromagnetically driven.

  In the present embodiment, only the position adjustment of the second scanning unit 5 is performed by the scanning position adjusting unit 8, but the present invention is not limited to this, and the position adjustment of the first scanning unit may be performed. However, according to the image display control method shown in the present embodiment, the first direction and the second direction can be orthogonalized by adjusting the position of only the second scanning unit. Therefore, compared with the case where the positions of the first scanning unit and the second scanning unit are adjusted, the first direction and the second direction can be orthogonalized as quickly as possible with a simple process.

  In the present embodiment, the image display control is performed by the processing unit 3, but is not limited thereto. For example, the position of the second scanning unit is adjusted using the scanning position adjusting unit based on the angle calculated by the user. Thus, image display control may be performed.

  In the present embodiment, whether or not the position adjustment of the second scanning unit 5 is necessary is determined based on whether or not the angle calculated by the scanning position control unit 32 is a value within a predetermined angle range of 90 ± 0.167 degrees. However, the predetermined angle range is not limited to the range of 90 ± 0.167, and may be any range as long as it does not exceed the resolution of the imaging unit.

  In the present embodiment, the imaging position adjustment unit 9 adjusts the position of the imaging unit 6 in the three axis directions of the XX axis, the YY axis, and the ZZ axis. However, the present invention is not limited thereto, and for example, the imaging position adjustment unit may adjust the position of the imaging unit in the six-axis directions. In this case, when the position of the image pickup unit is adjusted by rotational movement, position adjustment information regarding how many times the image pickup unit has been rotated is stored in the RAM or the like of the image display control device, and the first scanning unit Alternatively, when the position adjustment of the second scanning unit is performed, the stored position adjustment information of the imaging unit needs to be fed back.

DESCRIPTION OF SYMBOLS 1 Image display control apparatus 2 Measuring part 3 Processing part 32 Scan position control part 4 1st scanning part 5 2nd scanning part 6 Imaging part 7 Calculation part 71 1st calculation part 72 2nd calculation part 73 Angle calculation part 8 Scan position adjustment Unit 9 Imaging position adjustment unit BM Beam IA Imaging range LD Vertical direction SD Horizontal direction LR Light receiving element DF First direction DS Second direction

Claims (6)

In a scanning light measuring device for measuring a scanned beam,
An imaging unit for imaging a scanned beam in a predetermined imaging range set in advance;
A first calculation unit that calculates an inclination of the beam scanned in the first direction within the imaging range from an output signal of the imaging unit when a beam scanned in the first direction is captured by the imaging unit;
A second calculation unit that calculates an inclination of the beam scanned in the second direction within the imaging range from an output signal of the imaging unit when a beam scanned in the second direction is captured by the imaging unit;
An angle calculation unit that calculates an angle between the first direction and the second direction from the inclination calculated by the first calculation unit and the inclination calculated by the second calculation unit. A scanning light measuring device. The imaging unit is disposed in a first imaging reference direction of the imaging range and a second imaging reference direction orthogonal to the first imaging reference direction, and detects a plurality of beams that are scanned within the imaging range. Having a light receiving element,
The first calculator has the first intensity having a predetermined first intensity in the first intensity distribution in the first imaging reference direction of the intensity of the beam scanned in the first direction detected by the plurality of light receiving elements. A point at a predetermined position between two first positions in the imaging reference direction is determined as a first feature point, and an approximate first connecting the plurality of first feature points determined in the first imaging reference direction. Calculating a slope within the imaging range of the beam scanned in the first direction from the slope of the linear function;
The second calculation unit has the second intensity having a predetermined second intensity in a second intensity distribution in the second imaging reference direction of the intensity of the beam scanned in the second direction detected by the plurality of light receiving elements. A point at a predetermined position between two second positions in the imaging reference direction is determined as a second feature point, and an approximate second that connects the plurality of second feature points determined in the second imaging reference direction. The scanning light measuring apparatus according to claim 1, wherein the inclination of the beam scanned in the second direction within the imaging range is calculated from the inclination of a linear function. In an image display control device comprising: a first scanning unit that reflects an incident beam and scans in a first direction; and a second scanning unit that reflects an incident beam and scans in a second direction.
An imaging unit for imaging a scanned beam in a predetermined imaging range set in advance;
A first calculation unit that calculates an inclination of the beam scanned in the first direction within the imaging range from an output signal of the imaging unit when a beam scanned in the first direction is captured by the imaging unit;
A second calculation unit that calculates an inclination of the beam scanned in the second direction within the imaging range from an output signal of the imaging unit when a beam scanned in the second direction is captured by the imaging unit;
An angle calculation unit that calculates an angle between the first direction and the second direction from the inclination calculated by the first calculation unit and the inclination calculated by the second calculation unit;
An image display control device comprising: a control unit that controls at least one of the scanning units so that the angle calculated by the angle calculation unit is a right angle. The imaging unit is disposed in a first imaging reference direction of the imaging range and a second imaging reference direction orthogonal to the first imaging reference direction, and detects a plurality of beams that are scanned within the imaging range. Having a light receiving element,
The first calculator has the first intensity having a predetermined first intensity in the first intensity distribution in the first imaging reference direction of the intensity of the beam scanned in the first direction detected by the plurality of light receiving elements. A point at a predetermined position between two first positions in the imaging reference direction is determined as a first feature point, and an approximate first connecting the plurality of first feature points determined in the first imaging reference direction. Calculating a slope within the imaging range of the beam scanned in the first direction from the slope of the linear function;
The second calculation unit has the second intensity having a predetermined second intensity in a second intensity distribution in the second imaging reference direction of the intensity of the beam scanned in the second direction detected by the plurality of light receiving elements. A point at a predetermined position between two second positions in the imaging reference direction is determined as a second feature point, and an approximate second that connects the plurality of second feature points determined in the second imaging reference direction. The image display control apparatus according to claim 3, wherein an inclination of the beam scanned in the second direction within the imaging range is calculated from an inclination of a linear function. An image used in an image display device including a first scanning unit that reflects an incident beam and scans in the first direction, and a second scanning unit that reflects the incident beam and scans in the second direction. In the display control method,
An imaging step of imaging a scanned beam in a predetermined imaging range set in advance;
When a beam scanned in the first direction is imaged by the imaging step, a first calculation for calculating an inclination of the beam scanned in the first direction within the imaging range from a signal indicating an imaging result of the imaging step Steps,
Second calculation for calculating the inclination of the beam scanned in the second direction within the imaging range from the signal indicating the imaging result of the imaging step when the beam scanned in the second direction is captured by the imaging step. Steps,
An angle calculation step of calculating an angle between the first direction and the second direction from the inclination calculated by the first calculation step and the inclination calculated by the second calculation step;
And a control step for controlling at least one of the scanning units so that the angle calculated by the angle calculating step is a right angle. The imaging step includes an intensity detection step of detecting an intensity of one of the beam scanned in the first direction and the beam scanned in the second direction,
In the first calculation step, the first imaging reference having a predetermined first intensity in the first intensity distribution in the first imaging reference direction of the intensity of the beam scanned in the first direction detected by the intensity detection step. An approximate first linear function that determines a point at a predetermined position between two first positions in the direction as a first feature point and connects the plurality of first feature points determined in the first imaging reference direction Calculating the inclination within the imaging range of the beam scanned in the first direction from the inclination of
In the second calculation step, a predetermined first in the second intensity distribution in the second imaging reference direction orthogonal to the first imaging reference direction of the intensity of the beam scanned in the second direction detected in the intensity detection step. A point at a predetermined position between two second positions in the second imaging reference direction having two intensities is determined as a second feature point, and the plurality of second feature points determined in the second imaging reference direction 6. The image display control method according to claim 5, wherein an inclination in the imaging range of a beam scanned in the second direction is calculated from an inclination of an approximate second linear function connecting the two.