JP2799016B2 - Image sensor position adjustment device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to an image sensor position adjustment for aligning an image plane of a lens and a light receiving surface of a solid state image sensor in a camera or the like using a solid state image sensor. It concerns the device.

[Conventional technology]

FIG. 4 is a sectional view showing a conventional image pickup device flange position adjusting device of this type.

In the figure, 1 is a C-mount screw 10 for mounting a lens.
1 and a lens mount having a lens mounting surface 102, 2 is a U-shaped slit which slides on the convex portion of the lens mount 1 as an axis.
Ring 3 having 201, 3 is a pin fitted to slit 201 of ring 2, 4 is an adjustment ring in which irregularities 41 are formed on the outer periphery like a spur gear, and ring 2 is screwed, and 5 is adjusted together with lens mount 1. A chassis 6 for holding the ring 4 so as not to move in the axial direction; 6 a set screw for fixing the lens mount 1 to the chassis 5; 7 a ball pressed against a concave portion of the adjustment ring 4 by a repulsive force of a compression coil spring 8; Is a screw screwed to the chassis 5 to prevent the compression coil spring 8 from coming off, 10 is a case for housing the solid-state imaging device 11 having the light receiving surface 111 and the optical filter 12, and 13 is a chassis 5 for positioning the case 10. Guide pins 14 are press-fitted into
A compression coil spring 15 for pressing the case 10 against the ring 2 through the nut is a nut for preventing the compression coil spring 14 from coming off.

In this conventional device, the direction of movement of the case 10 is different depending on the winding direction of the outer peripheral thread of the ring 2 and the direction of the rotational force applied to the adjustment ring 4. A case in which a force in the direction in which the distance is increased is applied will be described.

When a force greater than a specified value is applied to the adjustment ring 4, the ball 7 pressed by the compression coil spring 8 is pushed back into the chassis 5, so that the adjustment ring 4 starts rotating. At this time, the ring 2 also attempts to rotate in the same direction due to the frictional force of the threaded portion, but this movement is prevented by the pin 3, so that the ring 2 slides in the axial direction, and the case 10 is moved. Push back. When the light receiving surface 111 of the solid-state imaging device 11 accommodated in the case 10 moves to a predetermined position and the applied force is removed, the ball 7 pushed by the compression coil spring 8 is moved to the concave portion of the adjustment ring 4. The adjustment ring 4 is locked so that it does not rotate.

Next, when the direction of the force applied to the adjustment ring 4 is reversed, since the case 10 is always pressed against the ring 2 by the compression coil spring 14, similarly, the lens mounting surface 102 of the lens mount is The distance between the light receiving surfaces 111 of the elements becomes smaller.

[Problems to be solved by the invention]

Since the conventional image sensor position adjusting device is configured as described above, the chassis and the lens mount must be separated, and the number of components increases. Furthermore, there is a problem that the image center of the lens, which must be matched, and the light receiving surface center of the image sensor are displaced when combined due to a gap between a set screw and a hole or a gap between a lens mount and a chassis. There was.

The present invention has been made in order to solve such a problem, and an object of the present invention is to obtain an image sensor position adjustment that has a simple structure and does not cause a center shift during assembly.

[Means for solving the problem]

An imaging position adjusting device according to the present invention includes an imaging element storage case having a tapered first engagement portion, a chassis having a first screw portion for attaching a lens, and the tapered first engagement portion. A second engagement portion having a tapered shape and a concentrically provided with the second engagement portion having a tapered shape.
An image sensor position adjusting device having a second screw portion screwed to the first screw portion, a rotation restricting device for restricting rotation of the image sensor position adjusting device, and the image sensor housing case on the chassis side. And an urging means for urging.

Also, in the imaging position adjusting device according to the next invention, the imaging element position adjusting means has an uneven portion on an outer peripheral surface larger in diameter than the second screw portion, and the rotation restricting means has an unevenness of the imaging element position adjusting means. A projection that engages with the portion, and an elastically deformable beam that urges the projection toward the uneven portion.

[Action]

In the image pickup position adjusting device according to the present invention, the image pickup device position adjusting means includes a tapered second engagement portion fitted to the tapered first engagement portion of the image pickup device housing case and the tapered second engagement portion. Has a second screw portion which is provided concentrically with the engaging portion of the first screw portion and is screwed to the first screw portion, so that the rotation of the second screw portion adjusts the distance between the imaging element housing case and the chassis. In this case, the tapered second engagement portion is rotated while maintaining the engagement with the tapered first engagement portion in accordance with the rotation of the second screw portion, so that a gap is not generated and the tapered second engagement portion is configured. The number of parts is reduced.

Further, in the imaging position adjusting device according to the next invention, the imaging element position adjusting means has an uneven portion on the outer peripheral surface larger than the second screw portion, and the rotation restricting means has an uneven portion of the imaging element position adjusting means. Is provided, and an elastically deformable beam for urging the protrusion toward the uneven portion is provided, so that the configuration is simplified.

〔Example〕

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

That is, in FIG. 1, reference numeral 17 denotes a chassis provided with a C-mount screw 171 for attaching a lens and a rib 172; C-mount screw 171 for chassis 17
The adjusting ring 19 has a screw 183 that is screwed into the adjusting ring 18. The elastic ring 19 has a protrusion 191 that engages with the concave-convex portion 181 of the adjusting ring 18. A case for storing a solid-state image sensor, which is provided with a convex portion 193 for accommodating an optical filter to be moved and slidably supported by a rib 172 of the chassis 17, and 20 is a leg of the solid-state image sensor housed in the case 19. The substrate 21 thus held is a double torsion type torsion coil spring which presses the case 19 against the adjustment ring 18 around a projection 173 provided on the rib 172 of the chassis 17. The other configuration is the same as that of the conventional one shown in FIG.

In such a configuration, the case 19 moves in a different direction depending on the direction in which the adjustment ring 18 is turned, but a case in which a force in a direction in which the screw is loosened is applied will be described first.

When a force greater than the specified value is applied to the adjustment ring 18, the projection 19 pressed against the recess of the adjustment ring 18 by the elastic force of the beam 192.
1 is pushed out and the adjustment ring 18 starts rotating. At this time, the case 19 also attempts to rotate in the same direction due to the frictional force of the contact surface, but this movement is prevented by the rib 172 provided on the chassis 17, so that the case 19 is fitted with a C-mount lens. The translation is performed so as to increase the distance between the surface 102 and the light receiving surface 111 of the solid-state imaging device. At this time, the case 19 is pressed against the adjusting ring 18 by the double torsion type spring 21,
In addition, since the adjustment ring 18 and the case 19 are fitted with a tapered surface, their axes do not shift.

When the light receiving surface 111 of the solid-state imaging device moves to a specified position, if the applied force is removed, the case 1
The projections 191 of the nine enter the recesses of the adjustment ring 18 and lock so that the adjustment ring 18 does not rotate with a force less than the specified value. Next, when the direction of the force applied to the adjusting ring 18 is reversed, the case 19 is always pressed against the adjusting ring 18 by the double torsion type spring 21. The distance between 102 and the light receiving surface 111 of the solid-state imaging device becomes narrow.

〔The invention's effect〕

According to the present invention, in the image pickup position adjusting device, the image pickup preventing position adjusting means includes a tapered second engagement portion fitted to the tapered first engagement portion of the image pickup device housing case and the tapered second engagement portion. The second screw portion is provided concentrically with the second engaging portion and has a second screw portion screwed to the first screw portion. When adjusting the interval, a gap is created by rotating the tapered second engagement portion while maintaining engagement with the tapered first engagement portion in accordance with the rotation of the second screw portion. In addition, a high-accuracy imaging position adjusting device without center shift can be obtained, and the number of constituent parts can be reduced.

Further, according to the next invention, in the image pickup position adjusting device, the image pickup element position adjusting means may include an uneven portion on an outer peripheral surface having a diameter larger than that of the second screw portion, and the rotation restricting means may include an image pickup element position adjusting means. Is provided with a projection that engages with the uneven portion, and a beam that is elastically deformed to urge the projection toward the uneven portion is provided, so that the configuration is simplified, and the assembly can be easily performed. There is an effect that the backlash of the threaded portion of the first screw portion and the second screw portion can be easily adjusted without occurrence of backlash.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention.
FIG. 2 is an exploded perspective view, FIG. 2 is a cross-sectional view of a main part, FIG. 3 is a perspective view of a main part, and FIG. 4 is a cross-sectional view showing a conventional image sensor position adjusting device of this type. In the figure, 4, 18 are adjustment rings, 5, 17 are chassis, 10, 19
Denotes an image sensor storage case, 191 denotes a projection, 192 denotes a beam, and 193 denotes a projection. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

(57) [Claims] An imaging device housing case having a tapered first engagement portion; a chassis having a first screw portion for attaching a lens; and a taper fitted to the tapered first engagement portion. Second
An image pickup element position adjusting means having a second screw portion provided concentrically with the engagement portion and the tapered second engagement portion and screwed into the first screw portion; An image sensor position adjusting device, comprising: a rotation restricting device for restricting rotation of the element position adjusting device; and an urging device for urging the image sensor housing case toward the chassis. 2. The image pickup device position adjusting means has an uneven portion on an outer peripheral surface having a diameter larger than that of the second screw portion, and the rotation restricting means has a projection which engages with the uneven portion of the image pickup device position adjusting device. 2. The apparatus according to claim 1, further comprising an elastically deformable beam for urging the projection toward the concave / convex portion.