JP2003274231A - Solid-state imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid-state imaging device which can adjust the focus with high accuracy by moving a lens without tilt against an imaging plane and reduce production costs. <P>SOLUTION: A solid-state image sensor 2 is mounted on a circuit board 1 for a camera. A lens unit 3 which holds a lens 4 is located at the position which can image a subject on the imaging plane 2a of the sensor 2. The lens unit 3 is an engaged unit of a first lens holder 31 which holds the lens 4 with a second lens holder 32 which is fitted to the circuit board 1. A distance between the lens 4 and the imaging plane 2a is determined by fitting a protrusion 31c provided to the first lens holder 31 and a cavity 32c provided to the second lens holder 32. The protrusion 31c comprises three protrusions of the same height as a set and the cavity comprises three cavities of the same depth into which a set of protrusions can fit, as a set. Several sets are provided, and by selecting a fitting position for the protrusion and the cavity, the distance between the lens 4 and the imaging plane 2a is changed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state image pickup device for picking up an image using a solid-state image pickup device.

[0002]

2. Description of the Related Art In a conventional device of this type, a solid-state image pickup device is arranged on the surface of a camera circuit board, and a signal transmission circuit pattern of the solid-state image pickup device is provided on the front surface or both front and back surfaces of a camera circuit board. The circuit elements such as are connected to the circuit pattern and arranged. On the front surface side of the camera circuit board, a lens unit is fixed at a position where an image can be picked up on the image pickup surface of the solid-state image pickup element. The lens unit includes a first lens holder that holds the lens, and a second lens holder that is screwed to the first lens holder and attached to the camera circuit board. The first lens holder is rotated by the threaded portion to advance and retreat toward the image pickup surface, and the distance between the lens and the image pickup surface is adjusted to adjust the focus.

[0003]

As described above, in the conventional configuration in which the first lens holder and the second lens holder are screwed together to adjust the focus, the first lens holder and the second lens holder are separated from each other. When molding with plastic,
Since the male screw and the female screw have to be formed, there is a problem that the structure of the molding die becomes complicated and the molding work becomes complicated. Further, there is a problem that the lens is tilted with respect to the image pickup surface, and it is not possible to focus with high accuracy.

Therefore, the present invention provides a solid-state image pickup device capable of moving a lens forward and backward without tilting with respect to an image pickup surface with high precision and at a low cost without connecting by screwing. .

[0005]

In the solid-state image pickup device of the present invention, a solid-state image pickup device is mounted on a circuit board for a camera, and a lens is provided at a position where a subject image can be picked up on the image pickup surface of the solid-state image pickup device. Is provided for holding the lens. In the lens unit, a first lens holder holding the lens is engaged with a second lens holder attached to the camera circuit board, and the first lens holder and the second lens holder are provided on one side. The protrusion provided is engaged by fitting into the recess provided on the other side, and one of the protrusion and the recess is an engaging portion between the first lens holder and the second lens holder. Are provided so as to be able to advance and retreat toward the image pickup surface, and the distance between the lens and the image pickup surface can be changed by selecting the fitting position of the protrusion and the recess. It is characterized by that. As described above, since the projection and the recess are fitted to each other and the first lens holder and the second lens holder are engaged with each other without screwing, the structure of the mold is simplified and the lens unit is simplified. The manufacturing cost can be reduced without complicating manufacturing.

The protrusions are formed as a set of a plurality of the same height, and the recess is formed as a set of a plurality of the same depth into which the plurality of protrusions can be fitted. Preferably. With this configuration, the first lens holder and the second lens holder are in contact with each other at a plurality of positions, so that the posture of the lens is stable and no tilt occurs.

It is preferable that a plurality of recesses having different depths are provided as the recesses, and the projections are selectively fitted into any one of the recesses. Further, it is preferable that a plurality of protrusions having different heights are provided as the protrusions, and the recesses are selectively fitted into any one of the protrusions.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding one embodiment of the present invention,
A description will be given with reference to the drawings.

As shown in FIGS. 1 and 2, a solid-state image pickup device 2 is mounted on the front side of a camera circuit board 1,
The lens unit 3 is fixed at a position where a subject image can be captured on the imaging surface 2a of the solid-state imaging device 2. The lens unit 3 includes a first lens holder 31 and a second lens holder 3
2 is engaged and the end surface of the second lens holder 32 is adhered to the surface of the camera circuit board 1. The lens 4 is held in the first lens holder 31, and the second lens
The filter 5 is mounted in the lens holder 32.

The first lens holder 31 has a cylindrical portion 31a and a flange portion 31b at its front end, and the lens 4 is held in the cylindrical portion 31a in such a manner that it cannot be removed. Second
The lens holder 32 has a cylindrical portion 32a and a square tubular portion 32b as shown in FIG. 2, and the filter 5 is attached to the square tubular portion 32b so as not to come out. Cylindrical part 3
1a is slidably engaged in the cylindrical portion 32a in the axial direction, that is, in the optical axis direction of the lens 4.

Next, the first lens holder 31 is attached to the lens 4
A configuration will be described in which the second lens holder 32 is engaged so that the lens can move back and forth toward the imaging surface 2a.

As shown in FIGS. 1 and 3, the back surface of the ring-shaped brim portion 31b of the first lens holder 31 has the same height in the optical axis direction of the lens 4 and the circumferential direction of the cylindrical portion 31a. The three protrusions 31c provided at equal intervals are formed as one set. In addition, as shown in FIGS. 1 and 4 to 6, the ring-shaped surface of the cylindrical portion 32a of the second lens holder 32 has the same depth in the optical axis direction of the lens 4, and the cylindrical portion 32a has the same depth. With three recesses provided at equal intervals in the circumferential direction as one set, three recesses 32c, 3 having different depths are provided.
2d and 32e are formed. That is, the recesses 32c having the shallowest depth are formed at three positions at equal intervals, the recesses 32d having an intermediate depth are formed at three positions at equal intervals, and the deepest recesses 32e are formed at three positions at equal intervals. It is formed on. The protrusion 31c can be selectively fitted into any one of the three recesses.

Therefore, when the projection 31c is fitted into the recess 32c, the depth of the recess 32c is shallow, and therefore the distance between the lens 4 and the image pickup surface 2a becomes large. When the protrusion 31c is fitted into the recess 32d, the depth of the recess 32d is deeper than that of the recess 32c, and therefore the distance between the lens 4 and the imaging surface 2a becomes short. When the protrusion 31c is fitted into the recess 32e, the depth of the recess 32e is the deepest, so the lens 4
Is closest to the imaging surface 2a. In this way, by selecting the fitting position between the protrusion 31c and the recesses 32c to 32e, the distance between the lens 4 and the image pickup surface 2a can be adjusted, and the focusing can be performed. A subject image can be picked up on the image pickup surface 2a of the solid-state image pickup device 2 by the incident light that has passed through.

As described above, the protrusion 31c and the recess 32c ...
By fitting with 32e, the first lens holder 3
Since the first lens holder 32 and the first lens holder 32 are engaged with each other, the structure of the mold is not complicated and the manufacturing of the lens unit 3 is not complicated as compared with the case where the first lens holder 32 and the second lens holder 32 are engaged with each other by screwing. Also, without increasing the manufacturing cost,
The lens 4 can be made parallel to the image pickup surface 2a, and focusing can be performed with high accuracy.

In the above embodiment, three sets of recesses having different depths are separately provided as the recesses, but the present invention is not limited to this, and more sets of recesses having different depths are provided. If so, focusing can be performed more finely. Further, the recesses may not be provided separately, but may be provided continuously in a stepwise manner, which enables finer focusing. Further, the recesses may be one set having the same depth, and a plurality of sets having different heights may be provided as the protrusions. Further, the protrusions and the recesses may be provided so that they can be fitted to each other, and the number of one set is not limited to three.

[0016]

According to the present invention, the first lens holder and the second lens holder are engaged with each other by fitting the protrusion provided on one side into the recess provided on the other side. Since the distance between the lens and the imaging surface is changed by selecting the fitting position with the recess,
The lens moves forward and backward without tilting with respect to the image pickup surface, enabling highly accurate focus adjustment. Since it does not rely on screwing, there is no need to form male and female threads, and manufacturing can be facilitated.
The manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a rear view of the first lens holder of the above.

FIG. 4 is a plan view of the same with the first lens holder removed.

FIG. 5 is a perspective view of FIG.

FIG. 6 is a development view illustrating the depth of a recess.

[Explanation of symbols]

1 Camera circuit board 2 Solid-state image sensor 2a Imaging surface 3 lens unit 31 1st lens holder 31c protrusion 32 Second lens holder 32c, 32d, 32e Recess 4 lenses

Claims (4)

[Claims] 1. A solid-state image pickup device is mounted on a camera circuit board, and a lens unit for holding a lens is provided at a position where an image of a subject can be picked up on an image pickup surface of the solid-state image pickup device. In the lens unit, a second lens holder that holds the lens is attached to the second camera circuit board.
The first lens holder and the second lens holder are engaged with each other by engaging a protrusion provided on one side with a recess provided on the other, and the protrusion is engaged with the lens holder. Alternatively, one of the recesses may be the first
A plurality of engaging portions between the lens holder and the second lens holder are provided so as to be able to advance and retreat toward the imaging surface, and by selecting a fitting position between the protrusion and the recess, A solid-state imaging device, wherein a distance between the imaging surface and the imaging surface can be changed. 2. The protrusion according to claim 1, wherein the protrusion is formed of a plurality of sets having the same height, and the recess is formed by:
1 with a plurality of the same depth at which the plurality of protrusions can be fitted
A solid-state imaging device, which is configured as a set. 3. The recess according to claim 1, wherein a plurality of recesses having different depths are provided as the recesses, and the protrusion is selectively fitted into any one of the recesses. A solid-state image pickup device comprising: 4. The protrusion according to claim 1, wherein a plurality of protrusions having different heights are provided as the protrusions, and the recess is selectively fitted to any one of the protrusions. A solid-state imaging device characterized by the following.