JP2010266708A - Main mirror structure for single lens reflex camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main mirror structure that lessens errors in an attaching position of a main mirror body in a quick return mirror of a single lens reflex camera. <P>SOLUTION: The main mirror structure 1 constituting the quick return mirror of the single lens reflex camera includes a main mirror body 10 having a reflection surface. The structure 1 includes a holder 20 that is a frame surrounding a back and a side surface of the main mirror body 10, and has an insertion hole 26 for inserting the main mirror body 10 from a side where a rotary shaft 22 for mirror operation is set, and a holding member holding and fixing the reflection surface and the back of the main mirror body 10 after the main mirror body 10 is inserted through the insertion hole 26. The frame of the holder 20 has, at least, a bottom 21BT opposed to the back of the main mirror body 10, and a side (lower side 21LW) opposed to a side surface on a side separate from the rotary shaft 22 of the main mirror body 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a main mirror structure that constitutes a quick return mirror of a single-lens reflex camera, and relates to a structure that reduces a mounting error of a main mirror body.

  Conventionally, as in Patent Document 1, a main mirror body constituting a quick return mirror of a single-lens reflex camera is fixed to a holder that holds the main mirror body by bonding. In this case, an adhesive is applied between the bottom portion of the holder facing the back surface of the main mirror body and the back surface of the main mirror body.

JP 2006-189539 A

  However, an error in the attachment position of the main mirror body may occur due to an error in the thickness of the main mirror body. In the case of a single-lens reflex camera, the mounting error of the main mirror body has a great effect on the visibility of the viewfinder.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a main mirror structure that reduces an error in the mounting position of the main mirror main body in a quick return mirror of a single-lens reflex camera.

  The main mirror structure constituting the quick return mirror of the single-lens reflex camera according to the present invention is a main mirror body having a reflecting surface and a frame surrounding the back and side surfaces of the main mirror body. A holder having an insertion port for insertion from the side where the shaft is provided, and a clamping member that clamps and fixes the reflection surface and the back surface of the main mirror body after insertion of the main mirror body through the insertion port, The frame has at least a bottom portion that faces the back surface of the main mirror body, and a side portion that faces the side surface of the main mirror body away from the rotation axis.

  The main mirror main body is fixed to the holder by such sandwiching. Since the main mirror body is pressed by the sandwiching member, even if there is an error in the thickness of the main mirror body, the reflection surface of the main mirror body is fixed at a position where it comes into contact with the sandwiching member. For this reason, it is possible to reduce an error in the attachment position of the main mirror main body as compared with the case where the pressing using the sandwiching member is not performed.

  In addition, when the insertion port of the main mirror body is arranged on the side away from the rotation axis of the holder, the reflected light from the surface on the side away from the rotation axis of the main mirror body is shielded when viewed from the mount surface. In order to prevent the main mirror body from being displaced outward (side direction away from the rotation axis) due to centrifugal force during mirror operation when the fixed state due to pinching or adhesion becomes weak, It is necessary to cover the insertion port provided on the other side with another part, but when the insertion port is arranged on the side where the rotation shaft of the holder is provided, there is no need to provide such another part.

  Preferably, the holder is used for injecting adhesive from the back side of the holder, has an adhesive hole penetrating the bottom, and a first light shielding sheet is provided between the main mirror main body and the bottom.

  After the sandwiching, the fixing is further ensured by the adhesive through the adhesive hole. Since the main mirror main body can be fixed to the holder by pinching, it is possible to suppress the injection amount of the adhesive as compared with the case in which the main mirror main body is not fixed by the pinching. Further, since the adhesive is injected through the bonding hole, there is little possibility that the position of the main mirror main body varies in the thickness direction during solidification.

  More preferably, after the adhesive is injected, a second light shielding sheet is provided to close the adhesive hole from the back side of the holder.

  The second light shielding sheet can prevent the reflected light of the adhesive in the bonding hole from leaking out.

  Preferably, the rotation shaft is provided on an insertion path when the main mirror main body is inserted into the holder via the insertion port, and the main mirror main body is inserted with the rotation shaft removed from the holder. The rotation axis is attached to the holder after the main mirror body is inserted.

  Since the rotating shaft is mounted on the insertion path after the pinching, the main mirror main body and the like can be prevented from coming out from the insertion port when the fixing state by the pinching or bonding becomes weak.

  Preferably, the sandwiching member includes a claw portion that contacts a part of an end portion of the main mirror body and a reflection surface of the main mirror body when the main mirror body is inserted, and a bottom portion.

  As described above, according to the present invention, in the quick return mirror of a single-lens reflex camera, it is possible to provide a main mirror structure that reduces errors in the attachment position of the main mirror body.

It is a perspective view of the main mirror structure before the assembly in this embodiment. It is the figure which looked at the main mirror mounting part in this embodiment from the back. It is a perspective view of the main mirror structure after the assembly in this embodiment. It is sectional drawing of the AA line of FIG. It is an enlarged view of the circumference | surroundings of the 3rd mirror pressing nail | claw in FIG.

  Hereinafter, the present embodiment will be described with reference to the drawings. A main mirror structure 1 constituting a quick return mirror of a single-lens reflex camera in the present embodiment includes a main mirror body 10 having a mirror surface, a first light shielding sheet 11, a second light shielding sheet 12, and a holder 20. In order to indicate the direction, when the main mirror structure 1 is mounted on the mirror box of a single-lens reflex camera, the portion that can be seen from the mount surface is the front surface, and the portion that can be seen from the shutter side is the back surface.

  The holder 20 is a member that holds the main mirror body 10 by press fitting, and includes a housing 21, a rotating shaft 22, first to third bonding holes 23 a to 23 c, a light shielding sheet positioning portion 24, a distance measuring hole 25, and first to first. 4 mirror holding claws 27a to 27d.

  The casing 21 is a frame that surrounds the back surface, right side surface, left side surface, and lower side surface of the main mirror main body 10, and when viewed from the front (mounting surface side), the bottom portion 21BT, the right side portion 21RS, the left side portion 21LS, and the lower side portion. At 21 LW, the main mirror main body 10 faces the back, right side, left side, and lower side (the side of the main mirror main body 10 on the side away from the rotation shaft 22). An insertion port 26 used for inserting the main mirror main body 10 and the first light shielding sheet 11 is provided on the upper side of the housing 21 (the side where the rotation shaft 22 used for mirror operation is present).

  When viewed from the front of the housing 21, the right side portion 21RS is provided with first and second mirror pressing claws 27a and 27b that project leftward, and the left side portion 21LS projects rightward. Third and fourth mirror pressing claws 27c and 27d are provided. The first to fourth mirror pressing frames 27a to 27d are provided with first to fourth projecting portions 28a to 28d having a semi-cylindrical shape protruding toward the bottom portion 21BT.

  The size position of each part is determined so that the distance between the first to fourth projecting parts 28a to 28d and the bottom part 21BT is slightly less than the total thickness of the main mirror main body 10 and the first light shielding sheet 11. The The first to fourth projecting portions 28a to 28d (first to fourth mirror pressing claws 27a to 27d) and the bottom portion 21BT sandwich the main mirror main body 10 and the first light shielding sheet 11 between the front and the back and fix the sandwiching members. Configure.

  The rotating shaft 22 is a rotating shaft for rotating the quick return mirror including the main mirror main body 10 during the moving operation, that is, the mirror up operation or the mirror down operation, and is provided on the upper side of the housing 21 when viewed from the front. . The rotation shaft 22 is provided on an insertion path when the main mirror main body 10 is inserted into the housing 21 through the insertion port 26. The main mirror main body 10 is inserted by the rotation shaft 22 using the housing 21. The rotary shaft 22 is attached to the housing 21 after the main mirror body 10 is inserted.

  The first to third bonding holes 23a to 23c are holes that penetrate the bottom portion 21BT of the housing 21, and the first bonding hole 23a is provided on the side close to the rotating shaft 22, and the second and third bonding holes 23b, 23 c is provided on the side far from the rotating shaft 22. After the main mirror main body 10 and the first light shielding sheet 11 are inserted into the housing 21, an adhesive is injected from the back side of the housing 21 through the first to third adhesive holes 23a to 23c, and the first light shielding is performed. The sheet 11 and the bottom portion 21BT of the housing 21 are fixed.

  The first light shielding sheet 11 is used to prevent light transmitted through the main mirror body 10 from leaking from the back surface of the casing 21 through the first to third bonding holes 23a to 23c. The first light shielding sheet 11 is also used for thickness adjustment in consideration of the thickness tolerance of the main mirror body 10. Specifically, even when the main mirror main body 10 is thinner than a predetermined thickness, the first light shielding sheet 11 is provided between the main mirror main body 10 and the bottom portion 21BT, so that the first to fourth protrusions 28a to 28d are provided. And the bottom portion 21BT can be fixed so as to sandwich the main mirror main body 10 with no backlash.

  The second light shielding sheet 12 is attached to the light shielding sheet positioning portion 24 provided on the back surface of the housing 21 after the injection of the adhesive, and used to prevent the reflected light of the adhesive in the first adhesive hole 23a from leaking out. Is done. Note that a light shielding sheet such as the second light shielding sheet 12 is not attached to the second and third bonding holes 23b and 23c. Since the second and third bonding holes 23b and 23c have a longer distance from the shutter than the first bonding hole 23a, even if the reflected light of the adhesive leaks out, the imaging surface (or film surface) behind the shutter This is because the possibility of reaching is low.

  The distance measurement hole 25 is a hole that penetrates the bottom 21BT of the housing 21, and the transmitted light of the main mirror main body 10 from the mount surface side is a sub-mirror (measurement surface) provided on the back surface (side near the shutter) of the housing 21. Provided to reach the distance mirror). Similarly, the first light shielding sheet 11 is provided with a hole having the same size as the distance measuring hole 25.

  In the present embodiment, when the main mirror main body 10 is inserted into the housing 21 via the insertion port 26 in order to attach the main mirror main body 10 to the housing 21, a part of the main mirror main body 10 is The first to fourth protrusions 28 a to 28 d are in contact with each other, a part of the first light shielding sheet 11 is in contact with the bottom 21 BT of the housing 21, the first to fourth protrusions 28 a to 28 d and the bottom of the housing 21 The main mirror main body 10 and the first light shielding sheet 11 are sandwiched by 21BT.

  The main mirror main body 10 and the first light shielding sheet 11 are fixed to the housing 21 by the sandwiching. After the pinching, the fixing is further ensured by the adhesive via the first to third bonding holes 23a to 23c. Since the main mirror main body 10 and the first light-shielding sheet 11 can be fixed to the casing 21 by the sandwiching, it is possible to suppress the injection amount of the adhesive as compared with the form in which the fixing by the sandwiching is not performed. Further, since the rotating shaft 22 is mounted on the insertion path after the pinching, the main mirror main body 10 and the like can be prevented from coming out from the insertion port 26 when the fixing state by the pinching or adhesion becomes weak.

  Further, the reflecting surface of the main mirror body 10 is applied to the first to fourth projecting portions 28a to 28d, and the position with respect to the holder 20 is accurately defined. Even if there is an error in the thickness of the main mirror main body 10, the reflection surface of the main mirror main body 10 does not change from the position in contact with the first to fourth protrusions 28a to 28d. For this reason, it becomes possible to reduce the error of the attachment position of the main mirror main body 10 compared with the form which does not perform pressing using this projection part.

  Since the adhesive is injected through the first to third bonding holes 23a to 23c, the position of the main mirror body 10 is less likely to fluctuate in the thickness direction during solidification.

  Further, when the insertion port of the main mirror main body 10 is arranged on the lower side of the casing 21 (side away from the rotation axis), the lower side of the main mirror main body 10 when viewed from the front (mounting surface side). The main mirror main body 10 is moved outward (downward direction (downward direction) by the centrifugal force during mirror operation in order to shield the reflected light from the surface (surface measured away from the rotation axis) and when the fixed state by pinching or adhesion becomes weak. In order to prevent displacement in the direction away from the rotation axis)), it is necessary to cover the insertion port provided on the lower side (side away from the rotation axis) with another component. However, when the insertion port 26 is arranged on the upper side of the housing 21 (the side on which the rotation axis is provided) as in the present embodiment, the upper side surface (the side surface on the side on which the rotation axis is provided) of the main mirror body 10 is Since it is not visible from the front, it is not necessary to shield the light and the possibility of shifting by centrifugal force is low, so there is no need to provide such a separate part.

  In the present embodiment, the rotating shaft 22 has been described as being disposed on the upper side of the main mirror body 10. However, the rotating shaft 22 may be disposed on the lateral side (right measurement or left side) of the main mirror body 10. Good. In this case, the right side surface (or left side surface) of the main mirror main body 10 corresponds to the side surface of the main mirror main body 10 on the side away from the rotation shaft 22, and the right side portion 21RS (or left side portion 21LS) of the holder 20 is the main side. This corresponds to the side portion of the mirror body 10 that faces the side surface on the side away from the rotation shaft 22.

DESCRIPTION OF SYMBOLS 1 Main mirror structure 10 Main mirror main body 11 1st light shielding sheet 12 2nd light shielding sheet 20 Holder 21 Case 22 Rotating shaft 23a-23c 1st-3rd adhesion hole 24 Light shielding sheet positioning part 25 Distance measuring hole 26 Insertion opening 27a ˜27d First to fourth mirror pressing claws 28a to 28d First to fourth protrusions

Claims (5)

A main mirror body having a reflective surface;
A frame that surrounds the back and side surfaces of the main mirror body, an insertion port for inserting the main mirror body from the side on which a rotation axis for mirror operation is provided, and after insertion of the main mirror body through the insertion port A holder having a sandwiching member that sandwiches and fixes the reflection surface and the back surface of the main mirror body,
The frame of the holder has at least a bottom portion facing the back surface of the main mirror main body, and a side portion facing a side surface of the main mirror main body away from the rotation shaft. The main mirror structure that constitutes the quick return mirror.   The holder is used for injecting an adhesive from the back side of the holder, has an adhesive hole penetrating the bottom, and a first light shielding sheet is provided between the main mirror body and the bottom. The main mirror structure according to claim 1, wherein the main mirror structure is a main mirror structure.   3. The main mirror structure according to claim 2, wherein after the adhesive is injected, a second light shielding sheet is provided to block the adhesive hole from the back side of the holder.   The rotating shaft is provided on an insertion path when the main mirror main body is inserted into the holder through the insertion port. The main mirror main body is inserted by removing the rotating shaft from the holder. The main mirror structure according to claim 1, wherein the rotating shaft is attached to the holder after the main mirror main body is inserted.   The sandwiching member includes a claw portion that contacts a part of an end portion of the main mirror main body and a reflection surface of the main mirror main body when the main mirror main body is inserted, and the bottom portion. The main mirror structure according to claim 1.

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