JP2012073479A - Light irradiation device, camera device and mobile terminal with camera - Google Patents

Abstract

A light irradiation device, a camera device, and a camera-equipped mobile terminal device capable of easily expanding or reducing a light irradiation range with a simple and small configuration.
The present invention relates to a curved reflector 19 in which an insertion hole 19a of a light source 12 is formed, a light source support 7 provided on the back side of the reflector 19 to support the light source 12, and the light source support 7 is moved. In the light irradiation apparatus including the light source driving unit 17 to be operated, the coil 15 fixed to the light source support 7 and the magnet 13 disposed to face the coil 15 are disposed in the space behind the curved portion of the reflector 19. By moving the light source support 7 in the direction of the optical axis of the irradiation lens 6 by the electromagnetic force when energized, the irradiation range to the irradiated object is expanded or reduced.
[Selection] Figure 1

Description

  The present invention relates to a light irradiation device that irradiates light to an irradiated object, a camera device including the light irradiation device, and a mobile terminal device with a camera.

Patent Document 1 discloses a light irradiation device that drives a light source support by driving means to change the light irradiation direction from a plurality of light sources. The technique described in Patent Document 1 changes the irradiation range and light distribution characteristics of an object to be irradiated by changing the light irradiation direction of a plurality of light sources.
Patent Document 2 discloses that an optical zoom function is provided in a small camera mounted on a mobile phone or the like.

JP 2007-47706 A JP 2007-53840 A

However, the light irradiation apparatus has a problem that it is difficult to obtain a uniform light amount in the light irradiation range in the configuration in which the light irradiation directions of a plurality of light sources are changed as described in Patent Document 1.
Also, when illuminating the subject during shooting with the camera, if the light irradiation range is smaller than the shooting field angle, the entire subject cannot be illuminated, and the light irradiation range is too large than the shooting field angle However, there is a problem in that light is unnecessarily spread and efficient use of electric power is hindered, and light leakage causes discomfort to the surroundings.

  Accordingly, an object of the present invention is to provide a light irradiation device, a camera device, and a mobile terminal device with a camera that can easily expand or reduce the light irradiation range with a simple and small configuration.

  According to the first aspect of the present invention, there is provided a light source, an irradiation lens, a curved reflector in which a light source insertion hole is formed, a light source support that is provided on the back side of the reflector and supports the light source, and a light source support. A light source driving unit that moves, the light source driving unit includes a coil fixed to the light source support and a magnet disposed opposite to the coil, and the coil and the magnet are disposed in a space behind the curved portion of the reflector. The light irradiation device is characterized in that the irradiation range for the irradiated object is expanded or reduced by moving the light source support toward the optical axis direction of the irradiation lens by electromagnetic force when the coil is energized.

  A second aspect of the invention includes the light irradiation device according to the first aspect of the invention and a zoom camera having an optical zoom lens, and the zoom camera calculates a shooting angle of view at a magnification set by the movement of the optical zoom lens. The light irradiation device is a camera device that drives a light source driving unit based on photographing field angle information received from a zoom camera.

According to a third aspect of the present invention, there is provided a camera-equipped mobile terminal device including the camera device according to the second aspect.
The mobile terminal device refers to a mobile phone, a personal digital assistant (PDA), a notebook computer, and the like.

According to the first aspect of the present invention, since the light source that irradiates the irradiated object with light is moved in the direction of the optical axis with respect to the irradiation lens, the structure can be easily and easily applied to the irradiated object. The light irradiation range can be enlarged or reduced.
Since the irradiated object can be illuminated within a predetermined range by enlarging or reducing the light irradiation range, the light irradiation range can provide an equal amount of light and reduce light leakage to the surroundings.

Since the light source driving unit is configured by a coil and a magnet, the configuration is simple, and since only the current supplied to the coil is controlled, drive control can be easily performed.
Compared to the case where the coil and the magnet are arranged in the space behind the curved portion of the reflector and arranged radially outside the outer peripheral edge of the reflector, the device on the surface orthogonal to the optical axis of the irradiation lens The overall size can be reduced, and the mounting density of the back side space of the reflector can be increased to reduce the size of the apparatus.

  According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be achieved, and the light source driving unit of the light irradiation device is driven according to the shooting angle of view of the camera. The light irradiation range can be easily expanded or reduced in conjunction with the shooting angle of view based on the zoom function.

  According to invention of Claim 3, the mobile terminal device with a camera which show | plays the same effect as the invention of Claim 2 can be provided.

It is a longitudinal cross-section which cuts and shows the light irradiation apparatus which concerns on 1st Embodiment of this invention in the MM position of FIG. It is the disassembled perspective view which looked at the light irradiation apparatus shown in FIG. 1 from the front side. It is the disassembled perspective view which looked at the light irradiation apparatus shown in FIG. 1 from the rear side. It is a perspective view of the board | substrate which provided the light source body shown in FIG. It is an optical path diagram explaining the effect | action of the light irradiation apparatus which concerns on 1st Embodiment. It is AA sectional drawing shown in FIG. It is BB sectional drawing shown in FIG. It is a front view of the camera concerning a 1st embodiment. It is a block diagram which shows the structure of the control part of the light irradiation apparatus which concerns on 1st Embodiment, and a lens drive device.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. The light irradiation device 1 according to the present embodiment is a light irradiation device for an optical zoom camera 4 incorporated in a mobile phone 2 as shown in FIG. Used to irradiate the subject with light in the dark.

  As shown in FIGS. 1 to 3, the light irradiation device 1 includes a frame 8 having an irradiation lens 6 fixed on the inner periphery, a base 5 on which the frame 8 is mounted, and a reflector provided between the frame 8 and the base 5. 19 and an annular holder 16 are provided.

  The reflector 19 has a substantially hemispherical shape in which the subject side (hereinafter referred to as “front side”) is a concave reflecting surface (surface), and is located on the opposite side of the subject side (hereinafter simply referred to as “rear side”) in the reflector 19. A cross-shaped cut portion 19a is formed on the bottom surface. A part of the light source 12 and the light source support 7 is disposed in the cut portion 19a. The reflector 19 reflects a part of the light emitted from the light source 12 toward the irradiation lens 6.

  As shown in FIG. 1, a light source driving unit 17 that moves the light source 2 in the optical axis direction of the irradiation lens is disposed on the back surface side of the reflector 19 and on the inner peripheral side of the annular holder 16.

  As shown in FIGS. 1 to 3, the light source driving unit 17 includes a yoke 3, a front spring 9 disposed on the front side of the yoke 3, a rear spring 11 disposed on the rear side of the yoke 3, and a magnet 13. And the light source support 7. The yoke 3 is held on the inner periphery of the holder 16.

  The light source 12 is fixed to one end 10 a of the substrate 10, and this one end 10 a is fixed to the front side of the light source support 7. The other end 10 b of the substrate 10 is fixed to the base 5. As shown in FIG. 1, a hall element 41 is attached to the substrate 10, and the hall element 41 is disposed to face a magnet 42 fixed to the holder 16. The Hall element 41 detects the moving distance of the light source 12 in the optical axis direction of the irradiation lens 6 by detecting the magnetic force of the magnet 42.

  The substrate 10 is formed with a bent portion 10c which is bent back and forth between the one end portion 10a and the other end portion 10b, and is movable in the optical axis direction of the irradiation lens 6 by elastic deformation of the bent portion 10c. .

  The yoke 3 is disposed on the inner periphery of the holder 16 in the space on the back surface side of the reflector 19, and has an annular shape along the circumferential direction of the reflector 19. The yoke 3 has a quadrangular outer periphery when viewed from the front side and a circular inner periphery when viewed from the front side, and a connecting wall that connects the outer peripheral wall 3a, the inner peripheral wall 3b, and the outer peripheral wall 3a and the inner peripheral wall 3b. 3c, and the outer peripheral wall 3a, the inner peripheral wall 3b, and the connecting wall 3c have a substantially U-shaped cross section.

As shown in FIG. 3, the connecting wall 3c is formed with an insertion hole 3e at a position between the corners 3d of the yoke 3. As shown in FIGS. 1 and 2, a coil fixing portion 23 protruding from the light source support 7 is movably inserted into the insertion hole 3 e with respect to the yoke 3.
Magnets 13 are fixed to the four corners 3d of the yoke 3 on the outer peripheral side of the inner peripheral wall 3b.

  The magnet 13 has different magnetic poles on the inner peripheral side and the outer peripheral side. For example, the outer peripheral surface is an N pole and the inner peripheral surface is an S pole.

  As shown in FIG. 2 and FIG. 3, the front spring 9 has a flat plate-like natural state before assembly, and an outer peripheral side portion 9 a that forms an annular shape in a plan view and an inner periphery from each corner of the outer peripheral side portion 9 a. The arm portion 9b protrudes from the arm portion 9b. The inner end 9c of the arm portion 9b is fixed to the front end 15a of the coil 15. Note that the outer peripheral side portion 9 b of the front spring 9 is sandwiched between the frame 8 and the holder 16.

The rear spring 11 has a flat plate-like natural state before assembly, and has an outer peripheral side portion 11a having a rectangular shape in plan view, and an arm portion 11b projecting from each corner of the outer peripheral side portion 11a toward the inner peripheral side. The inner peripheral side end 11c of the arm portion 11b is fixed to the outer peripheral side portion 7a of the light source support 7. An outer peripheral side portion 11 a of the rear spring 11 is sandwiched between the base 5 and the holder 16, and supports the light source support 7 with respect to the holder 16 so as to be movable in the optical axis direction (front side) of the irradiation lens 6. ing.
The rear spring 11 is divided into two parts 30, 32, one divided part 30 is connected to one end of the coil wire of the coil 15 and the other divided part 32 is connected to the other end of the coil wire, A direct current flows from the rear spring 11 to the coil 15.

  The light source support 7 is composed of an annular outer peripheral rib 7a and a radial rib 7b provided in a cross shape on the inner peripheral side of the outer peripheral rib 7a, and the front side of the central portion (the central portion of the cross) of the radial rib 7b. One end 10a of the substrate 10 is fixed to the substrate. As described above, the central portion of the radial rib 7 b is disposed in the cutout portion 19 a of the reflector 19 together with the light source 12. As a result, the light source 12 is disposed inside the curved reflecting surface of the reflector 19. A coil fixing portion 23 projects from the front side of the outer peripheral rib 7a.

  The coil 15 is wound around the periphery of the back surface of the reflector 19, the rear end 15 b is fixed to the coil fixing portion 23 of the light source support 7, and the front end 15 a is the inner peripheral side of the front spring 9 as described above. It is fixed to the end 9c.

  The light source 12 is an LED (light emitting diode) in the present embodiment, but may be a flashlight using a discharge tube, a light source that emits laser light, or the like. The LED is molded in a transparent resin.

  The irradiation lens 6 is a condensing lens. In the present embodiment, an LED having a large divergence angle is used as the light source 12, and is a convex lens. However, when the light source 12 having a small divergence angle is used, the irradiation lens 6 is It may be a concave lens.

  In the present embodiment, when no current is passed through the annular coil 15, the distance between the light source 12 and the irradiation lens 6 is the farthest as shown in FIG. 1, and the irradiation angle, that is, as shown in FIG. This is the case where the divergence angle from the irradiation lens 6 is the smallest and the irradiation range for the irradiated object P is the narrowest. When a current is passed through the annular coil 15, the light source 12 moves forward, and the light source 12 is generated between the resultant force of the urging forces in the front-rear direction of the front spring 9 and the rear spring 11, and the annular coil 15 and the magnet 13. Stop at a position where electromagnetic force suspends. That is, since the distance between the light source 12 and the irradiation lens 6 is shorter than when no current is passed through the annular coil 15, the irradiation angle is increased and the irradiation range of the irradiated object P is increased.

Next, the optical zoom camera 4 according to the present embodiment will be described with reference to FIGS. The optical zoom camera 4 includes a lens driving device 101 that drives a zoom lens, and a substrate 104 on which an image sensor 111 is mounted.
The lens driving device 101 includes a zoom lens holder 103, a focus lens holder 105, a zoom lens holder driving unit 107 that drives the zoom lens holder 103, and a focus lens holder driving unit that drives the focus lens holder 105. 109. This lens driving device 101 is mounted on a substrate 104 on which an image sensor 111 is provided. In the present embodiment, each of the image sensors 111 is a CCD (Charge Coupled Device), but may be a CMOS (Complementary Metal Oxide Semiconductor).

  Further, as shown in FIG. 7, a zoom lens position detection unit 143 that detects the position of the zoom lens holder 103 and a focus lens position detection unit 145 that detects the position of the focus lens holder 105 are provided in the housing 113. It is provided.

  As shown in FIG. 6, the zoom lens holder 103 holds the optical zoom lens 114, the focus lens holder 105 holds the focus lens 116, and forms an image with the subject side lens 118 on the housing 113. The side lens 120 is provided so that the optical axis of the zoom lens 114 and the focus lens 116 coincide.

  Since the zoom lens driving unit 107 and the focus lens driving unit 109 have substantially the same configuration, the zoom lens driving unit 107 will be described, and the same reference numerals will be given to the portions that exhibit the same effects as the focus lens driving unit 109. Thus, the description of that part is omitted.

  The zoom lens driving unit 107 (focus lens driving unit 109) includes a vibration member 117 and a driving shaft 121 (122) arranged in the optical axis direction, and a base end 121a (122a) of the driving shaft 121 (122). ) Is fixed to the vibration member 117. The tip 121b (122b) of the drive shaft 121 (122) is held by the housing 113 by a bearing member 112 that slidably holds the drive shaft 121 (122). The bearing member 112 is made of an elastically deformable member, and is made of silicon rubber in the present embodiment. A bearing member 110 that slidably holds the drive shaft 121 (122) is also attached to the housing 113 on the base end 121a (122a) side of the drive shaft 121 (122).

  The vibration member 117 includes a piezoelectric element 123 and an elastic vibrator 119 that is bonded and fixed to the surface of the piezoelectric element 123. The base end of the drive shaft 121 (122) is provided on the surface of the vibrator 119. 121a (122a) is bonded and fixed.

  On the other hand, as shown in FIGS. 6 and 7, a pressure contact portion 131 that is in pressure contact with the drive shaft 121 (122) is provided at one end portion of the zoom lens holder 103 (focus lens holder 105), as shown in FIG. The pressure contact portion 131 is in pressure contact with the side surface of the drive shaft 121 (122) by a spring 132.

  The other end portion of the zoom lens holder 103 is provided with an engagement portion 133 with the drive shaft 122 of the focus lens holder 105, and the engagement portion 133 engages with the drive shaft 122 of the focus lens holder 105, and the zoom lens holder The movement of 103 is guided. The engaging portion 133 is substantially U-shaped in cross section with the center side of the zoom lens holder 103 as the bottom, and the drive shaft 122 of the focus lens holder 105 is inserted into the U-shape.

  The other end portion of the focus lens holder 105 is provided with an engagement portion 133 with the drive shaft 121 of the zoom lens holder 103, and the engagement portion 133 engages with the drive shaft 121 of the zoom lens holder 103 to focus. The movement of the lens holder 105 is guided. The engaging portion 133 has a substantially U-shaped cross section with the center side of the focus lens holder 105 as the bottom, and the drive shaft 121 of the zoom lens holder 103 is inserted into the U shape.

  The configuration of the focus lens holder 105 is substantially the same as that of the zoom lens holder 103, and the drive shaft 122 of the focus lens holder 105 is attached to the vibration member 117 in the same manner as the drive shaft 121 of the zoom lens holder 103.

  Next, the zoom lens position detecting means 143 for detecting the position of the zoom lens holder 103 shown in FIG. 7 and the focus lens position detecting means 145 for detecting the position of the focus lens holder 105 will be described. The zoom lens position detection unit 143 and the focus lens position detection unit 145 have the same configuration, and each includes a magnetic pole member 157 in which different magnetic poles (S pole and N pole) are alternately arranged along the optical axis direction of the lens, and a magnetic field It comprises an MR sensor 159 that detects the intensity. The magnetic pole member 157 is fixed to the inner surface of the housing 113 along the drive shafts 121 and 122, and the MR sensor 159 is fixed to the holders 103 and 105. Along with this, it is possible to detect the amount and direction of movement of each holder from the reference position (or initial position).

  As shown in FIG. 8, the casing 113 is a rectangular parallelepiped as a whole, with the front side wall 115 forming a square when viewed from the front side in the optical axis direction. As shown in FIG. 7, the drive shafts 121 and 122 are positioned on a square diagonal line E viewed from the front side, and on the diagonal line F orthogonal to the diagonal line E, the zoom lens position detection unit 143 and the focus lens position detection are performed. Means 145 are provided.

  As shown in FIGS. 6 and 8, the front side wall 115 of the housing 113 is formed with a subject side lens holding opening 125 that holds the subject side lens 118 at the center of a square. On the diagonal line E, the drive shafts 121 and 122 are located at positions sandwiching the subject-side lens holding opening 125, and a fitting recess 127 for fitting the bearing member 112 of each drive shaft 121, 122 is formed. .

  As shown in FIG. 9, the control unit 21 of the camera 4 records the zoom setting unit 23, the shooting angle of view calculation unit 25, and the calculated shooting angle of view, and transmits the angle of view information to the light irradiation control unit 27. An angle-of-view information recording unit 29 is provided. On the other hand, the light irradiation control unit 27 is provided with an angle-of-view information receiving unit 31 and an illumination range control unit 33 that receive the angle-of-view information from the angle-of-view information recording unit 29.

  The zoom setting unit 23 detects the amount of movement of the zoom lens holder 103 in the lens driving device 101, and the shooting angle of view calculation unit 25 calculates the shooting angle of view of the camera as shown in FIG. 5 from the amount of movement of the zoom lens holder 103. Then, the calculated shooting field angle information is transmitted from the field angle information recording unit 29 to the field angle information degree receiving unit 31 of the light irradiation control unit 27. In the illumination range control unit 33, based on the shooting field angle information, a light irradiation angle (irradiation angle) slightly larger than the shooting field angle, for example, 1 to 5 degrees larger than the shooting field angle, The light source support 7 is moved. As a result, the irradiation angle of the light irradiated from the irradiation lens 6 is changed in accordance with the shooting angle of view, so that the subject can be illuminated in the optimum light irradiation range.

Next, the operation and effect of the light irradiation apparatus 1 according to the embodiment of the present invention will be described.
When the light irradiation device 1 is used when shooting with the camera 4, as described above, when the zoom lens holder 103 is moved to a predetermined shooting magnification position by the zoom setting unit 23, the angle-of-view calculating unit 25 correspondingly changes the camera angle. The photographing field angle is calculated, and the light irradiation apparatus 1 moves the light source 12 by the illumination range control unit 33 so that the irradiation angle is slightly larger than the photographing field angle.
In this case, as shown in FIG. 1, in the light irradiation device 1, a thrust F is generated between the light source support 7 and the magnet 13 due to the electromagnetic force generated by energizing the coil 15. It stops at a position that balances the biasing force of the spring 11.

Thereafter, a current is supplied to the light source 12 in conjunction with the shutter of the camera 4 so that the light source 12 emits light and irradiates the subject with light.
That is, according to the present embodiment, as shown in FIG. 5, the irradiation range can be enlarged or reduced by moving the position of the irradiation lens 6 in accordance with the shooting angle of view. Note that the relationship between the photographing magnification of the camera 4 and the irradiation angle by the light source 12 is determined based on data for which a correlation is obtained in advance.

According to the present embodiment, since the light source 12 is configured to move in the optical axis direction of the irradiation lens 6, the light irradiation range can be easily expanded or reduced with a simple configuration.
Since the irradiated object can be illuminated within a predetermined range by enlarging or reducing the light irradiation range, the light irradiation range can provide an equal amount of light and reduce light leakage to the surroundings.

The light source driving unit 17 is configured by the coil 15 and the magnet 13, so that the configuration is simple, and since only the current supplied to the coil 15 is controlled, drive control can be easily performed.
By arranging the coil 15 and the magnet 13 in the back side space of the curved portion of the reflector 19, the overall size of the device on the surface orthogonal to the optical axis of the irradiation lens can be reduced and the mounting density of the back side space of the reflector is increased. The apparatus can be downsized.

  In particular, in the present embodiment, the light source driving unit 17 is disposed on the inner peripheral side of the holder 16 in the back space of the reflector 19 and is stored in the footprint of the reflector 19, that is, in the plane when the reflector is viewed from the front side. And it does not protrude from the footprint, so that the outer shape of the apparatus can be reduced.

  Since the light source support 7 and the coil 15 are held by the front spring 9 and the rear spring 11 at two locations on the front side and the rear side, they can be held stably.

  Based on the movement position of the optical zoom lens 114 of the optical zoom camera 4, the lens support 7 is moved by the illumination range control unit 33 according to the angle of view calculated by the angle of view calculation unit 25. The irradiation range can be controlled.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the light irradiation device 1 is used as a camera flash in a camera-equipped mobile phone in the above-described embodiment, but is not limited thereto, and may be used in a microscope, a projection device, or the like.
The reflector 19 is not limited to a substantially hemispherical shape, and the cross section may be a parabolic shape or an elliptical shape.
When the magnetic force of the magnet 13 is sufficiently strong, the yoke 3 may be omitted.

DESCRIPTION OF SYMBOLS 1 Light irradiation apparatus 4A Lens drive device 6 Irradiation lens 7 Light source support body 12 Light source 13 Magnet 15 Coil 17 Light source drive part 19 Reflector

Claims (3)

A light source, an irradiation lens, a curved reflector in which an insertion hole for the light source is formed, a light source support that is provided on the back side of the reflector to support the light source, and a light source driving unit that moves the light source support.
The light source driving unit has a coil fixed to the light source support and a magnet disposed opposite to the coil, and the coil and the magnet are disposed in the space behind the curved portion of the reflector, and electromagnetic force when the coil is energized. By moving the light source support in the direction of the optical axis of the irradiating lens, the irradiation range for the irradiated object is expanded or reduced.   A light irradiation device according to claim 1 and a zoom camera having an optical zoom lens, wherein the zoom camera calculates a shooting angle of view at a magnification set by movement of the optical zoom lens, and the light irradiation device receives from the zoom camera. A camera apparatus for driving a light source driving unit based on the captured field angle information.   A camera-equipped mobile terminal device comprising the camera device according to claim 2.

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