JP5473637B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging device, and is particularly suitable for an imaging device in which an imaging unit having an imaging element is attached to a base member using a plurality of fixing screws.

  In an imaging device such as a digital camera that captures a subject image by converting it into an electrical signal, the imaging light beam is received by the imaging device, a photoelectric conversion signal output from the imaging device is converted into image data, and a memory card, etc. Record on a recording medium. A CCD (Charge Coupled Device), a CMOS sensor (Complementary Metal Oxide Semiconductor), or the like is used as the imaging device.

  In such an imaging apparatus, the imaging element must be held with high reliability while accurately maintaining the relative positional relationship between the plurality of optical components. Usually, in an imaging apparatus, as shown in Patent Document 1, an imaging element unit is formed by first fixing an imaging element to another component or a substrate, and the imaging element unit is adjusted with respect to the imaging apparatus. Generally, it is held by positioning.

  In the case of a digital single-lens reflex camera using a large-sized image sensor in recent years, the relative positional relationship between the image sensor and the optical viewfinder and positioning in the photographing focus direction are necessary. Therefore, position adjustment in the focus direction, up / down / left / right tilt adjustment for preventing one-sided blur, horizontal / vertical adjustment for adjusting the angle of view, and tilt rotation adjustment are required, and as a result, 6-axis adjustment is required.

  For example, in Patent Document 2, the positioning of the image sensor is completed in the image sensor unit, and the image sensor unit is attached to the main body of the image pickup apparatus. Here, the adjustment of the three axes of the position adjustment in the focus direction and the up / down / left / right tilt adjustment for preventing the one-sided blur is guaranteed by the positioning, and the adjustment is unnecessary. On the other hand, the three axes of horizontal / vertical adjustment and tilt rotation adjustment for adjusting the angle of view are adjusted by changing the thickness of the washer.

JP 11-261904 A JP 2005-65015 A

However, in the holding structure for the fixed image sensor disclosed in Patent Document 2, it is necessary to use the same number of washers as the screws when positioning the image sensor unit, and the parts cost and assembly cost are increased due to the large number of parts. Has the problem.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an imaging apparatus that reduces the number of parts of an imaging element unit and assembles the imaging element unit accurately and efficiently in a camera body. And

  The present invention includes an imaging device, an imaging unit including a substrate to which the imaging device is electrically connected, a base member to which the imaging unit is fixed by a fixing screw, and a shield member that covers at least a part of the substrate. The shield member has an arm portion that extends from a shield main body portion that covers at least a part of the substrate and is elastically deformable with respect to the shield main body portion, and a tip of the arm portion. A rotation stop portion is formed on the base member, and the fixing screw fixes the rotation stop portion together to fix the shield member to the imaging unit. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the number of parts of an image pick-up element unit can be reduced, and an image pick-up element unit can be assembled to a camera main-body part accurately and efficiently.

It is a perspective view which shows schematic structure of the whole camera which concerns on this embodiment. It is a figure which shows the external appearance structure inside the camera which concerns on this embodiment. It is a disassembled perspective view which shows the imaging unit and peripheral components which concern on this embodiment. It is sectional drawing which shows the structure which fixes the imaging unit which concerns on this embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the present embodiment, a digital single lens reflex camera (hereinafter referred to as a camera) will be described as an imaging apparatus. In each figure, the shooting direction of the camera is indicated by Fr as the front, the opposite direction is indicated by Rr as the rear, and the right side with respect to the shooting direction is indicated by R and the left side is indicated by L as necessary.
First, an overall schematic configuration of the camera according to the present embodiment will be described with reference to FIG. FIG. 1 is an external view of a camera according to the present embodiment, and shows a state in which a photographing lens unit (not shown) is removed. FIG. 1A is a perspective view of the camera viewed from the front side (subject side), and FIG. 1B is a perspective view of the camera viewed from the back side (photographer side).

  As shown in FIG. 1A, on the front surface of the camera body 1, there is provided a mount portion 2 for detachably fixing the taking lens unit. The mount unit 2 is provided with a mount contact 3 that enables communication of a control signal, a status signal, a data signal, and the like between the camera body 1 and the photographing lens unit and supplies power to the photographing lens unit side. Further, the camera body 1 is provided with a lens lock release button 4 that is pressed when removing the mounted photographing lens unit at a position close to the mount unit 2.

  Inside the camera body 1, there is provided a mirror box 20 through which a photographic light beam that has passed through the photographic lens is guided. In the mirror box 20, a main mirror (quick return mirror) 6 for reflecting the photographing light flux in a predetermined direction is disposed. As shown in FIG. 1, the main mirror 6 is held at an angle of 45 ° with respect to the photographic optical axis so as to guide the photographic light beam in the direction of the penta roof mirror 7, and a fixed imaging device 8 (hereinafter, referred to as imaging device) To the state of being held at the position retracted from the photographing light flux.

The camera body 1 is provided with a grip portion 9 for a photographer to hold the camera body 1. The grip unit 9 is provided with a release button 10 for a photographer to instruct the camera 100 to perform photographing.
A flash unit 11 that pops up with respect to the camera body 1, a shoe groove 12 for attaching a flash, and a flash contact 13 are provided on the upper part of the camera body 1.

  As shown in FIG. 1B, a finder eyepiece window 14 is provided on the back surface of the camera body 1 so that the photographer can observe the imaging light beam reflected by the main mirror 6 described above. A color liquid crystal monitor 15 capable of displaying an image is provided near the center of the back of the camera body 1.

Next, the external configuration of the inside of the camera 100 will be described with reference to FIG. FIG. 2 is a perspective view showing the external configuration of the inside of the camera. FIG. 2A is a perspective view of the camera as viewed from the front side, and FIG. 2B is a perspective view of the camera as viewed from the back side.
The camera body 1 includes a body chassis 30. The mirror box 20 and the shutter unit 31 described above are attached to the subject side of the main body chassis 30 with screws or the like.
An imaging unit 40 and a shield member 50 described later are disposed on the photographer side of the main body chassis 30.

Next, a configuration around the imaging unit 40 will be described with reference to FIG. FIG. 3 is an exploded perspective view showing components around the imaging unit 40. FIG. 3A is an exploded perspective view of each component viewed from the front side, and FIG. 3B is an exploded perspective view of each component viewed from the back side.
In FIG. 3A, the component parts are arranged in the order of the mount portion 2, the mirror box 20, the main body chassis 30, the imaging unit 40, and the shield member 50 along the photographing optical axis from the front side.

  The mirror box 20 is a base member and is formed in a box shape having a size capable of disposing the main mirror 6 therein. The mirror box 20 has a plurality of cylindrical bosses 21 extending rearward along the photographing optical axis. Specifically, the bosses 21 of the present embodiment are provided on the rear side of the mirror box 20 and on the upper left side, lower left side, and right side. Each boss 21 is formed with a female screw portion 22. A fixing screw 61 as a fixing member described later is screwed into the female screw portion 22 from the rear side. The mirror box 20 has a small-diameter axial positioning projection 23 extending rearward at a position close to each female screw portion 22.

  The main body chassis 30 is formed by bending a metal plate. The main body chassis 30 is appropriately formed with notches so as not to interfere with the fixing screws 61 when the fixing screws 61 are screwed into the respective female screw portions 22. The main body chassis 30 is attached to the mirror box 20 by being firmly fastened to the mirror box 20 from the rear side by screws (not shown).

The imaging unit 40 includes a sensor plate 41, a substrate 44, an imaging device 8, and an optical low-pass filter 45. A substrate 44 is attached to the sensor plate 41 from the rear side, and an optical low-pass filter 45 is attached from the front side. Further, on the front side of the substrate 44, the imaging element 8 is fixed by soldering and electrically connected. Since the image pickup device 8 is positioned by a positioning hole provided in a lead frame (not shown) of the substrate 44, it is fixed with a predetermined accuracy. The substrate 44 to which the image sensor 8 is fixed is fixed by screws (not shown) by engaging positioning holes (not shown) with positioning protrusions (not shown) of the sensor plate 41.
In the imaging unit 40, the optical low-pass filter 45, the imaging element 8, and the substrate 44 are arranged in this order from the front side, and are in a unitized state.

  The sensor plate 41 is provided with a plurality of insertion holes 42 through which the fixing screws 61 are inserted at portions corresponding to the female screw portions 22 described above. Specifically, the insertion holes 42 according to the present embodiment are provided on the upper left side, the lower left side, and the right side of the sensor plate 41. Further, the sensor plate 41 is provided with a plurality of positioning holes 43 into which the above-described positioning protrusions 23 are inserted in proximity to the respective insertion holes 42.

  The shield member 50 has a function of an electromagnetic shield that covers at least a part of the substrate 44 from the rear side. The shield member 50 includes a flat shield body 51 that covers at least a part of the substrate 44 and a rotation stop 52 that is substantially elliptical. The rotation stopper 52 is formed at the tip of an arm 53 that extends from the shield body 51 toward a portion corresponding to each female screw 22 described above. Specifically, the rotation stoppers 52 are provided on the upper left side, the lower left side, and the right side of the shield member 50. The rotation stopper 52 is formed with an insertion hole 54 through which the fixing screw 61 is inserted. The rotation stopper 52 has a role of a washer so that the fixing screw 61 screwed into the female screw portion 22 does not rotate and loosen. Further, the rotation stopper 52 is provided with a positioning hole 55 into which the above-described positioning protrusions 23 are inserted in the vicinity of the insertion hole 54.

  Each arm portion 53 is formed to have a length approximately twice the major axis length of the substantially elliptical rotation stop portion 52. Moreover, each arm part 53 is formed so that the width | variety is narrower than the short-axis length of the rotation stop part 52 of substantially elliptical shape. Therefore, the arm portion 53 itself can be elastically deformed, and the space between the shield main body portion 51 and the rotation stop portion 52 can be changed via the arm portion 53 by applying an external force. On the other hand, when the external force disappears, the elastic force of the arm portion 53 returns to the original state between the shield body 51 and the rotation stopper 52.

  A plurality of metal coil-like compression springs 63 (hereinafter referred to as springs) as urging members are provided between the mirror box 20 and the imaging unit 40. The spring 63 according to the present embodiment is disposed between each female screw portion 22 of the mirror box 20 and each insertion hole 42 of the imaging unit 40. In a state where the imaging unit 40 is attached to the mirror box 20, the imaging unit 40 is biased rearward by the spring 63. That is, the spring 63 biases the imaging unit 40 and the mirror box 20 in a direction in which they are separated. The spring 63 is not limited to metal but may be rubber.

  The imaging unit 40 and the shield member 50 are attached to the mirror box 20 using a fixing screw 61. The fixing screw 61 is inserted into the insertion hole 54 of the shield member 50 and the insertion hole 42 of the sensor plate 41 and is screwed into the female screw portion 22. Therefore, when fixing the imaging unit 40 to the mirror box 20, the fixing screw 61 fastens the rotation stopper 52 together. As a result, the shield member 50 is also fixed to the imaging unit 40. Since the head 62 of the fixed screw 61 is disk-shaped and is larger than the hole diameter of the insertion hole 54 of the rotation stopper 52, the head 62 contacts the rotation stopper 52 when the fixing screw 61 is screwed. The head 62 may be a screw having a normal shape such as a pan shape.

Next, a method for attaching the imaging unit 40 will be described. The imaging unit 40 needs to be mounted such that the imaging surface of the imaging element 8 is spaced a predetermined distance from and parallel to the mounting surface of the mount unit 2 that serves as a reference for mounting the photographic lens unit.
First, the main body chassis 30 is fixed to the mirror box 20 from the rear side with screws (not shown). Next, the springs 63 are fitted on the outer circumferences of the bosses 21 of the mirror box 20.

  Next, the imaging unit 40 to which the imaging element 8 is attached is superimposed on the rear side of the main body chassis 30. At this time, positioning can be easily performed by superimposing the positioning projections 23 of the mirror box 20 on the positioning holes 43 of the imaging unit 40 while inserting them.

Next, the shield member 50 is superimposed on the rear side of the imaging unit 40. At this time, positioning can be easily performed by overlapping the positioning projections 23 of the mirror box 20 while inserting the positioning projections 23 of the mirror box 20 into the positioning holes 55 of the shield member 50.
Finally, the fixing screw 61 is inserted into the insertion hole 54 of the shield member 50 and the insertion hole 42 of the sensor plate 41, and screwed into the female screw portion 22 of the mirror box 20. The imaging unit 40 can be attached by screwing the fixing screw 61 until the head 62 of the fixing screw 61 contacts the rotation stopper 52 of the shield member 50.

Further, since each rotation stopper 52 is formed integrally with the shield member 50, the rotation stopper 52 is inserted by screwing the fixing screw 61 into the insertion hole 54 of the shield member 50 and screwing into the female screw portion 22. Can be attached, improving the efficiency of assembly.
In the camera body 1 assembled in this way, the imaging unit 40 and the shield member 50 are supported in a floating manner by a spring 63 that urges both of them backward. Further, since the positioning hole 43 of the imaging unit 40 and the positioning projection 23 of the mirror box 20 are formed with high precision, the mirror box 20 and the imaging device 8 of the imaging unit 40 have a horizontal and vertical direction and a tilt rotation direction. The positional relationship can be attached with high accuracy. That is, by attaching the imaging unit 40, three axes of horizontal and vertical adjustments and tilt rotation adjustments of the imaging element 8 with respect to the imaging optical axis are determined.

  Next, a method for adjusting the imaging unit 40 will be described. Since the image pickup surface of the image pickup device 8 varies in position and inclination in manufacturing in the package, in the present embodiment, the image pickup surface can be adjusted to match the correlation position between the photographing lens and the image pickup surface of the image pickup device 8. . For adjustment, adjust the position in the focus direction and adjust the three axes of up / down / left / right tilt to prevent one-sided blur, and loosen the fixing screw 61 while measuring the distance and inclination from the lens mounting surface of the mount unit 2 to the image sensor 8. Or by tightening.

  In a state where the imaging unit 40 is assembled, the imaging unit 40 is urged rearward by the spring 63. Therefore, by rotating each fixing screw 61 so that the screwing amount with the female screw portion 22 is reduced, the imaging unit 40 is biased by the spring 63 and moves rearward. Further, the imaging unit 40 moves forward against the bias of the spring 63 by rotating each fixing screw 61 so that the screwing amount with the female screw portion 22 is increased. The rotation of the fixing screw 61 may be either manual or automatic adjustment using a tool.

By adjusting in this way, the position and inclination of the imaging unit 40 in the optical axis direction are determined. In the fixed screw 61 that has been adjusted, the head 62 is in contact with the rotation stopper 52. Therefore, the rotation stopper 52 suppresses the rotation of the fixed screw 61 and prevents the fixed screw 61 from loosening.
In this embodiment, in order to completely prevent the fixing screw 61 from loosening, an adhesive 70 is attached between the rotation stopper 52 and the head 62 of the fixing screw 61 as shown in FIG. The fixing screw 61 and the rotation stopper 52 are completely fixed.

  In the present embodiment, since the imaging unit 40 is floatingly supported by the spring 63, there is a possibility that the imaging unit 40 may instantaneously move to the subject side due to an impact on the camera 100 or the like after adjustment. Since the imaging unit 40 and the shield member 50 are integrally connected by the fixing screw 61, the imaging unit 40 and the shield member 50 try to move similarly. At this time, an external force from the moving shield member 50 causes a force such that the fixing screw 61 peels from the adhesive 70. However, the arm part 53 between the shield body 51 and the rotation stopper 52 bends to absorb the force that the shield body 51 tries to peel off the fixing screw 61.

  Further, since the bending range of the arm portion 53 is limited between the shield main body portion 51 and the rotation stop portion 52, the shield main body portion 51 is not deformed, and the function of the electromagnetic shield with respect to the substrate 44 is improved. It will not be damaged.

As described above, according to the present embodiment, since the plurality of rotation stoppers 52 are formed integrally with the shield member 50, the efficiency of the work of assembling the imaging unit 40 to the mirror box 20 is improved and the parts are integrated. Parts cost can be reduced.
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to embodiment mentioned above, A various deformation | transformation and change are possible within the range of the summary. In the above-described embodiment, only the case where the three rotation stoppers 52 are formed integrally with the shield main body 51 of the shield member 50 has been described. However, the present invention is not limited to this case. For example, you may form integrally so that three rotation stop parts may be connected. In the present embodiment, the imaging unit 40 and the shield member 50 are fixed to the mirror box 20. However, even if the imaging unit 40 and the shield member 50 are fixed to the main body chassis 30, the same effect can be obtained. .

1: Camera body 8: Image sensor (fixed image sensor) 20: Mirror box (base member)
21: Female screw part 23: Positioning protrusion 30: Main body chassis 40: Imaging unit 42: Insertion hole 43: Positioning hole 44: Substrate 45: Optical low-pass filter 50: Shield member 51: Shield main part 52: Anti-rotation part 53: Arm Portion 54: Screw insertion hole 55: Positioning hole 61: Fixing screw (fixing member)
63: Spring (biasing member) 70: Adhesive

Claims (4)

An image sensor and an image pickup unit comprising a substrate to which the image sensor is electrically connected;
A base member to which the imaging unit is fixed by a fixing screw;
A shield member covering at least a part of the substrate;
The shield member is formed with an arm portion that extends from a shield main body portion that covers at least a part of the substrate and is elastically deformable with respect to the shield main body portion, and a rotation stop portion at the tip of the arm portion. Formed,
An image pickup apparatus, wherein when fixing the image pickup unit to the base member, the fixing screw fixes the rotation stopper together to fix the shield member to the image pickup unit.   The imaging apparatus according to claim 1, wherein the rotation stopper and the fixing screw are fixed by an adhesive. The base member has a positioning protrusion extending along the optical axis direction,
The imaging apparatus according to claim 1, wherein the rotation stopper has a positioning hole through which the positioning protrusion is inserted. Between the imaging unit and the base member, provided with a biasing member that biases them in a direction to separate them,
The imaging apparatus according to claim 1, wherein a distance between the imaging unit and the base member can be adjusted by rotating the fixing screw.

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