JPH04104667A - Flange back control mechanism - Google Patents

Abstract

PURPOSE:To eliminate position deviation between the center of the image of a lens and the center of the photodetecting face of a solid-state imaging device and to easily enable flange back control even after the completion of assembly by respectively providing wavy uneven parts at the respective joint parts of a lens mount and an adjusting ring to rotate and slide them each other and holding the rotational positions. CONSTITUTION:A ring-shaped wavy uneven face 6 is provided near the fitting part of a lens mount 2 on an enclosure 1, and a wavy uneven face 13 is provided on the end face of an adjusting ring 12 which is slidably and rotatably fitted to the outer periphery of a cylindrical part 3a of the lens mount 2. These wavy uneven faces 6 and 13 are engaged so as to be freely slid and contacted. A helical guide groove 14 is provided on the inner face of the adjusting ring 12 and the tip of a guide pin 9 is fitted in. Therefore, the positions of the adjusting ring 12 and the enclosure 1 are held so as not to freely rotate them each other, and when the guide pin 9 is moved back and forth, the flange back control to the lens can be executed for the solid-state imaging device in a case 7. Thus, there is no position deviation between the center of the image of the lens and the center of the photodetecting face of the solid-state imaging device, and flange back control is made easy even after the assembly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flange back adjustment mechanism for aligning the imaging surface of a lens and the light receiving surface of a solid-state image sensor in a camera using a solid-state image sensor. It is something.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional flange back adjustment mechanism. In the figure, 20 is a lens mount equipped with a lens mount screw 20a for attaching a lens, and 21 is a U that slides around the convex part of the lens mount 20. A ring with a letter-shaped slit, 22 a pin fitted into the slit of the ring 21, and 23 an adjustment ring with an uneven outer periphery like a spur gear. The adjustment ring 23 is threadedly engaged with the ring 21, and is also inserted between the locking piece 24a of the chassis 24 and the lens mount 20 so as not to move in the axial direction. Also, 25 is lens mount 2
0 to the chassis 24; 26 is a ball pressed against a recess formed on the outer peripheral surface of the adjustment ring 23 by the repulsive force of the compression coil spring 27; 28 is a ball that prevents the compression coil spring 27 from coming off. A screw, 29, a case for housing the solid-state image sensor 40 and an optical filter 41, 30
In order to position this case 29,
4 is a guide pin press-fitted into the ring 21; 31 is a compression coil spring that presses the case 29 against the ring 21 via the board 32;
3 is a nut that prevents the compression coil spring 31 from being removed.

Next, the operation will be explained.

The winding direction of the thread on the outer periphery of the ring 21 and the adjustment ring 23
The direction in which the case 29 moves varies depending on the direction of the rotational force applied to the lens mount 20 and the case 29, but first, a case will be described in which a force is applied to the adjustment ring 23 in a direction that increases the distance between the lens mount 20 and the case 29.

When a force exceeding a specified value is applied to the adjustment ring 23, the ball 26, which had been pressed by the compression coil spring 27, is pushed back into the chassis 24, so that the adjustment ring 23 starts rotating. At this time, the ring 21 also tries to rotate in the same direction due to the frictional force of the threaded portion, but this movement is blocked by the pin 22, so the ring 21 resists the springing of the compression coil in the axial direction toward the substrate 32. and slide to push up the case 29. The solid-state image sensor 4 housed in the case 29
When the light-receiving surface 42 of o has moved to the specified position, the adjustment ring 23 is released, and the ball 26, which is being pushed by the compression coil spring 27, is released.

It enters the recessed portion of the adjustment ring 23 and is locked so that the adjustment ring 23 cannot be rotated by a force below a specified value.

Next, when the direction of the force applied to the adjustment ring 23 is reversed, the case 29 is always applied to the substrate 3 by the compression coil spring 31.
Similarly, the distance between the lens fitting surface 20A of the lens mount and the light receiving surface 42 of the solid-state image sensor 40 becomes narrow.

[Problem to be solved by the invention]

Since the conventional flange back adjustment mechanism is configured as described above, the chassis and lens mount are separated, and the work of assembling them with the set screw 25 is troublesome, and the number of parts increases. There were issues such as high costs. Furthermore, the center of the lens image must match the light receiving surface 4 of the solid-state image sensor 40.
2, due to the gap between the set screw 25 and the screw hole, or the gap between the lens mount 20 and the chassis 24,
There were issues such as misalignment when putting them together.

Further, when adjusting the flange back, it is necessary to remove the cover of the casing (not shown) that houses each of the adjustment members and adjust the flange back inside the casing, which poses problems such as the adjustment work being time-consuming.

Note that a technique similar to the conventional flange back adjustment mechanism is described in Japanese Patent Application Laid-Open No. 102669/1983.

This invention was made to solve the above-mentioned problems.The structure is simple, the center of the lens image and the center of the light-receiving surface of the solid-state image sensor do not shift during assembly, and even after assembly is completed. To provide a flange back adjustment mechanism that can easily perform flange back adjustment without removing the cover of a housing.

[Means to solve the problem]

The flange back adjustment mechanism according to the present invention includes a cylindrical lens mount that is attached to the outside of a housing and has a guide groove extending in the axial direction in the cylindrical part, and a guide that is slidably fitted into the guide groove. a case for mounting a solid-state image sensor having a protrusion and slidably fitted into the lens mount; a compression spring that biases the case in one direction with respect to the housing; and a compression spring provided in the case. A pin protruding toward the outer circumference of the lens mount, and an adjustment ring having a spiral groove on the inner circumference into which the tip of the pin is inserted and slidably fitted onto the outer circumference of the lens mount. The lens mount and the adjustment ring are provided with undulating concave and convex portions at their joints, respectively, so that they can rotate and slide relative to each other and maintain their rotational positions.

[Effect]

The lens mount in this invention protrudes to the outside of the housing, and the adjustment ring is fitted into the outer periphery of the lens mount.
By rotating this adjustment ring from the outside of the housing, the wave-like uneven parts provided on the adjustment ring and the housing slide against each other, and when they stop sliding, they prevent each other from rotating freely. The position is retained. Further, by the above rotation operation, the kite pin in which the spiral groove is inserted is moved in the front and back direction, and the flange back of the guide pin and the solid-state image sensor in the case having the guide protrusion can be adjusted with respect to the lens. .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a housing, and a cylindrical lens mount 2 is attached to this housing 1.

3 is a screw for attaching the lens provided on the inner circumference of the lens mount 2; 3a is a cylindrical portion of the lens mount;
Reference numeral 4 denotes a guide groove formed by cutting out the vicinity of the housing attachment portion of the lens mount 2, and reference numeral 5 denotes a notch formed in the housing 1 so as to be continuous with the guide groove 4. 6 is a wavy uneven surface formed in a ring shape near the attachment part of the lens mount 2 on the housing 1;
is a cylindrical case whose tip is fitted into the inner periphery of the lens mount 2, and a guide protrusion 8 and a guide pin 9 for preventing rotation are attached to the outer periphery of the case 7. The guide protrusion 8 is fitted into the guide groove 4 cut out in the lens mount 2 so as to be able to slide in the axial direction, and the guide pin 9 is inserted into the notch 5 and the guide groove 4, and extends toward the outer circumference of the cylindrical portion 3a. It stands out. 10 is a plate-shaped spring holding plate attached to the rear end of the case 7, 11 is a plurality of compression springs interposed between the housing 1 and the spring holding plate 10, and 12 is a cylindrical portion of the lens mount 2. It is an adjustment ring that is slidably and rotatably fitted onto the outer periphery of 13
is a wavy uneven surface provided on the end face of the adjustment ring 12, and is adapted to be slidably engaged with the wavy uneven surface 6. Reference numeral 14 denotes a spiral guide groove carved on the inner surface of the adjustment ring 12, into which the tip of the guide pin 9 fits.

FIG. 2 is a sectional view showing the assembled structure of the flange back adjustment mechanism. According to Nire, the case 7 is inserted into the lens mount 2, and at this time the kite protrusion 8 is guided into the guide groove 4. , and is slidably inserted in the axial direction. In addition, the compression spring 11 is connected to the housing 1 and the spring retaining plate 10.
It is interposed between.

Further, the adjustment ring 12 is slidably fitted onto the outer periphery of the lens mount 2, and at this time, the spiral guide groove 14
The end of the guide bin 9 protruding from the guide groove 4 is inserted into the guide groove 4. Furthermore, a lens case 16 having a lens 15 is screwed into the screw 3 of the lens mount 2 and attached. 17 is a solid-state image sensor mounted inside the case 7.

Next, the operation will be explained.

The case 7 is slidable in the front-rear direction within the cylindrical portion 3a of the lens mount 2, and the guide pin 9 on the case 7 is fitted into the spiral guide groove 14 of the adjustment ring 12, so that the adjustment ring By rotating 12, the case 7 slides in the front-back direction. At this time, the compression spring 11
Since the case 7 is urged rearward with respect to the housing 1, the wavy uneven surface 13 of the adjustment ring 12 meshes with the wavy uneven surface 6 of the housing 1. Therefore, when setting the case 7 at an appropriate position relative to the housing 1, the adjustment ring 12
After performing a click rotation operation, if the operation is released, the respective wavy uneven surfaces 6 automatically engage with each other and their rotational positions are maintained. Further, a guide protrusion 8 for preventing rotation of the case 7 is slidably fitted into a guide groove 4 in the cylindrical portion 3a, and prevents the solid-state image sensor 17 from tilting.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a cylindrical lens mount which is attached to the outside of the housing and has a guide groove extending in the axial direction in the cylindrical part, and which is slidably fitted into the guide groove. A case for mounting a solid-state image sensor, which has a guide protrusion and is slidably fitted into the lens mount, and a compression spring that biases the case in one direction with respect to the housing.

The case is provided with a pin that protrudes toward the outer circumference of the lens mount, and has a spiral groove on the inner circumference into which the tip of the bottle is inserted, and is slidably fitted onto the outer circumference of the lens mount. The lens mount and the adjustment ring are provided with a wave-like uneven portion at each joint, so that they can rotate and slide against each other and maintain their rotational positions, so it is easy to remove the adjustment ring. By performing a rotational operation from the outside of the housing, the case housing the solid-state imaging device can be moved in the axial direction, and therefore flange back adjustment is possible without removing the cover of the housing. In addition, free rotation of the adjustment ring can be prevented by the corrugated uneven portion, and the above-mentioned flange back adjustment can be performed with a simple structure and with high precision.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a flange back adjustment mechanism according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the flange back adjustment mechanism of FIG. 1. FIG. 3 is a sectional view showing a conventional flange back adjustment mechanism. 1 is the housing, 2 is the lens mount, 4 is the guide groove, 6.1
3 is a wavy uneven portion, 7 is a case, 8 is a guide protrusion, 9 is a guide bin, 11 is a compression spring, 12 is an adjustment ring, and 14 is a spiral groove. In Figure 1, the same reference numerals indicate the same or equivalent parts. (2 other people) 7,) T-mata 14, screw feces

Claims (1)

[Claims] A cylindrical lens mount attached to the outside of the housing and having a guide groove extending in the axial direction in the cylindrical part, and a guide protrusion slidably fitted into the guide groove, and the lens mount a case for attaching the solid-state image pickup device slidably fitted therein; a compression spring that biases the case in one direction with respect to the housing; and a compression spring provided in the case and protruding toward the outer circumference of the lens mount. an adjustment ring that has a spiral groove on its inner periphery into which the tip of the pin is inserted and is slidably fitted onto the outer periphery of the lens mount, and each joint between the lens mount and the adjustment ring. A flange back adjustment mechanism provided with a wavy concavo-convex portion which is provided in the parts and is rotatable and slidable relative to each other and can hold the rotational position.