JP5779976B2 - Electronic camera back - Google Patents

Description

  The present invention relates to an electronic camera back.

  A camera that obtains electronic image data by capturing a subject image obtained by a photographing optical system on the camera body side by mounting a camera back equipped with an image sensor on the camera body instead of the back cover provided on the camera body. A back exchangeable camera is known (see Patent Document 1).

  In the camera back described in Patent Document 1, a moving mechanism that moves the position of the image sensor and a position detection sensor that detects the position of the image sensor are provided, and the moving mechanism moves the image sensor based on the output of the position detection sensor. By moving, the imaging element is positioned with respect to the imaging optical system on the camera body side.

Japanese Patent Laid-Open No. 9-331475

  In the conventional technology, there is a problem that a position detection sensor for detecting the position of the image sensor has to be provided, and the configuration becomes complicated.

An electronic camera back according to the present invention is an electronic camera back to be attached to a camera body, an image pickup element for picking up a subject image by light passing through a rectangular opening of the camera body in a state of being attached to the camera body a fixing portion for fixing the device, a positioning portion provided on the fixed portion, and a camera back portion arranged with the fixing portion and the distance, a positioning portion to contact the first side of the opening to urge, A first urging portion that increases the urging force as the distance between the fixed portion and the camera back portion decreases.

  In the electronic camera back according to the present invention, the image sensor can be positioned with respect to the photographing optical system on the camera body side with a simple configuration.

It is explanatory drawing regarding the direction and coordinate system of a camera. It is a front view which illustrates the silver salt film camera combined with the electronic camera back by one embodiment of this invention. It is a rear view of the silver salt film camera illustrated in FIG. It is a rear view of the silver salt film camera which opened the back cover. It is a figure which illustrates the electronic camera back by this embodiment. It is sectional drawing of the electronic camera back illustrated in FIG. It is sectional drawing of the electronic camera back illustrated in FIG. FIG. 6 is a cross-sectional view when the electronic camera back illustrated in FIG. 5 is attached to the silver salt film camera illustrated in FIG. 2. FIG. 6 is a cross-sectional view when the electronic camera back illustrated in FIG. 5 is attached to the silver salt film camera illustrated in FIG. 2.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. First, the camera direction and coordinate system used in the present invention will be described. FIG. 1 is a perspective view illustrating a general 35 mm single-lens reflex camera (referred to as a silver salt film camera). In FIG. 1, the direction parallel to the optical axis of the camera is defined as the Z axis, the direction parallel to the film feeding direction is defined as the X axis, and the direction perpendicular to the X axis and the Z axis is defined as the Y axis. Further, the rotation direction about the X axis is defined as the pitching direction, the rotation direction about the Y axis as the yawing direction, and the rotation direction about the Z axis as the rolling direction.

  FIG. 2 is a front view illustrating a silver salt film camera combined with an electronic camera back according to an embodiment of the present invention. In FIG. 2, a photographing lens 1 is attached to a camera body 2 of a silver salt film camera. The photographing lens 1 includes a lens for forming an image of a subject on a photosensitive member (film, an image sensor in an electronic camera back), and a diaphragm.

  The camera body 2 is configured to maintain light tightness in a state in which the photographing lens 1 is attached. On the upper surface of the camera body 2, a release button 3, a winding lever 4 and a rewinding knob 5 are provided. The camera body 2 has a known shutter mechanism for exposing the photosensitive member for a predetermined time. When the release button 3 is pressed in a state where preparation for photographing is completed, the shutter mechanism starts running the shutter curtain. The photosensitive member is exposed for a predetermined time.

  The winding lever 4 is operated when winding the film by one frame. The camera body 2 is configured to perform a preparatory operation for driving the shutter mechanism along with film winding. Thereby, the shutter release operation when the release button 3 is pressed down next becomes possible.

  The rewind knob 5 is operated to wind up all the photographed films in the film cartridge loaded in the camera body 2 so that the cartridge can be taken out. Further, the back cover 7 described later is configured to open when the rewind knob 5 is pulled upward by a predetermined amount.

  FIG. 3 is a rear view of the silver salt film camera illustrated in FIG. In FIG. 3, the camera body 2 is provided with a viewfinder eyepiece window 6 and a back cover 7. The photographer observes an optical image from the viewfinder through the eyepiece window 6. The back cover 7 is opened by the pulling-up operation of the rewind knob 5 as described above. Loading and unloading of the film cartridge is performed with the back cover 7 opened.

  FIG. 4 is a rear view of the silver salt film camera illustrating the state where the back cover 7 is opened. In FIG. 4, the back cover 7 is configured to be rotatable about a hinge 17. A pressure plate 8 is provided inside the back cover 7. The pressure plate 8 is processed so that the surface thereof has high flatness and slidability. The back cover key 16 engages with the back cover key 13 provided on the cartridge chamber 12 side of the camera body 2 and the back cover 7 in a closed state.

  The outer rails 9a and 9b are disposed below and above the opening 11, respectively. Both rails 9 a and 9 b are provided at positions equivalent to each other with respect to the optical axis direction of the photographing lens 1. When the back cover 7 is closed, the outer rails 9 a and 9 b are configured to be in close contact with the pressure plate 8. The inner rails 10a and 10b are slightly lower in height than the outer rails 9a and 9b and close to the optical axis of the photographic lens 1 and are provided at positions equivalent to each other in the optical axis direction. The inner rail 10 a is located below the opening 11, and the inner rail 10 b is located above the opening 11.

  Since the inner rails 10a and 10b are slightly lower than the outer rails 9a and 9b (provided on the photographing lens 1 side), there is a slight space between the inner rails 10a and 10b and the pressure plate 8 with the back cover 7 closed. Is obtained. The film is fed through this space while maintaining high flatness. The inner rails 10a and 10b and the outer rails 9a and 9b are positioned so that the Z-direction position, the inclination in the pitching direction, and the inclination in the yawing direction are appropriate with respect to the photographing lens 1.

  The opening 11 determines a range in which an image taken by the photographing lens 1 is projected on the film. The opening 11 is a rectangular opening, and includes four sides of an upper side 11a, a lower side 11b, a left side 11c, and a right side 11d. The upper side 11a and the lower side 11b are long sides, and the left side 11c and the right side 11d are short sides. The opening 11 is positioned with respect to the photographing lens 1 so that the X direction position, the Y direction position, and the inclination in the rolling direction are appropriate. In FIG. 4, the shutter curtain is not shown for explaining the opening 11. In practice, the shutter curtain is provided so as to close the opening 11 from the photographing lens 1 side.

  The cartridge chamber 12 is a space for loading a film cartridge. The back cover key 13 moves upward in conjunction with the lifting of the rewind knob 5, and releases the engagement with the back cover key 16. The back cover 7 is opened by this disengagement.

  The sprocket 14 and the spool 15 rotate in conjunction with the operation of the winding lever 4. The sprocket 14 feeds one frame of film by rotation, and the spool 15 winds up the film fed by the sprocket 14 without slack.

  FIG. 5 is a diagram illustrating the electronic camera back 101 according to the present embodiment. The electronic camera back 101 is attached in place of the back cover 7 illustrated in FIGS. 2 and 3. In FIG. 5, the hinge 17 and the back cover key 16 are the same as the hinge 17 and the back cover key 16 provided on the back cover 7. In the electronic camera back 101, unlike the pressure plate 8 in the back cover 7, an image sensor holding plate 102 for holding the image sensor 103 is disposed in the camera back main body 101a. The image sensor 103 is fixed to the image sensor holding plate 102. When the electronic camera back 101 is attached to the camera body 2 and the back cover key 13 and the back cover key 16 on the camera body 2 side are engaged, the image sensor 103 faces the opening 11.

  The hinge 17 has a movable pin 17a at the top and a fixed pin 17b at the bottom. In a state where the pins 17a and 17b are fitted in the holes on the camera body 2, the electronic camera back 101 rotates around the pins 17a and 17b. The movable pin 17a is normally pushed upward by a spring (not shown). When the pin 17c coming out of the long hole portion 17d is pushed downward against the spring, the movable pin 17a retracts downward, so that the electronic camera back 101 can be attached to and detached from the camera body 2. Although not described in detail in FIG. 4, a similar attachment / detachment mechanism is also provided on the hinge 17 of the back cover 7.

  On the image sensor holding plate 102, a positioning convex portion 102 a for positioning the image sensor 103 when the electronic camera back 101 is mounted on the camera body 2 is provided on the upper side of the image sensor 103. The positioning convex part 102a has a substantially rectangular parallelepiped shape and projects toward the camera body 2 side. The positioning convex portion 102a functions as the Y positioning portion 102b whose upper side surface performs positioning in the Y direction, and the left side surface (the surface on the hinge 17 side) functions as the X positioning portion 102c that performs positioning in the X direction. Although the length of the Y positioning portion 102b in the X direction is shorter than the upper side 11a of the opening 11, it is configured to have a sufficient length. On the other hand, the length of the X positioning portion 102c in the Y direction is configured to be sufficiently short so as not to hit the upper portion of the image sensor 103. The length of the Y positioning portion 102b in the X direction is longer than the length of the X positioning portion 102c in the Y direction.

  When the Y positioning portion 102b is brought into contact with the upper side 11a of the opening portion 11 and the X positioning portion 102c is brought into contact with the left side 11C of the opening portion 11, positioning between the opening portion 11 and the image sensor holding plate 102 is performed. . With the imaging element holding plate 102 positioned in this way, the pixel arrangement direction is parallel to the XY direction of the camera body 2 and a predetermined position (for example, substantially the center) of the imaging surface coincides with the optical axis of the imaging lens 1. In addition, the mounting position of the image sensor 103 with respect to the photographing holding plate 102 is adjusted in advance.

  The image sensor holding plate 102 is provided with a hole 102d on the lower side of the image sensor 103, and a hole 102e on the right side of the positioning convex portion 102a.

  Further, Z-direction adjusting screws 104, 105, 106 for positioning the image sensor 103 in the Z direction are installed on the image sensor holding plate 102. Specifically, the Z direction adjustment screw 104 is located at the lower center of the image sensor holding plate 102, the Z direction adjustment screw 105 is located at the upper right corner of the image sensor holding plate 102, and the Z direction adjustment screw 106 is located at the upper left corner of the image sensor holding plate 102. Each is installed. The Z-direction adjusting screws 104 to 106 are configured such that when the electronic camera back 101 is closed with respect to the camera body 2, the Z-direction adjusting screws 104 abut against the inner rail 10a, and the Z-direction adjusting screws 105 and 106 are the inner rails. The position in the XY direction is adjusted so as to come into contact with 10b.

  FIG. 6 is a cross-sectional view of the electronic camera back 101 according to the present embodiment cut along a cross section AA shown in FIG. An image sensor chip 103 a is installed inside the image sensor 103. The image sensor chip 103a converts an image formed on the imaging surface 103b by the photographing lens 1 (FIG. 2) into electrical image information, and the conversion is performed only in a rectangular range of a predetermined size. Done. The image sensor 103 is provided with a glass plate 103c for protecting the image sensor chip 103a.

  Z-direction adjusting screws 104 to 106 (the Z-direction adjusting screw 105 is not shown in FIG. 6) are screwed into the image sensor holding plate 102 in a direction parallel to the Z direction. For example, when assembling the electronic camera back 101, these Z-direction adjusting screws 104 to 106 are rotated from the right by a screwdriver or the like, so that the tip portions thereof enter and exit relative to the image sensor holding plate 102. And the virtual plane comprised by the front-end | tip part of these three Z direction adjustment screws 104-106 corresponds with the virtual plane (namely, surface to which a film is fed) comprised by the inner rails 10a and 10b of the camera body 2. When this is done, the amount of protrusion of the tips of the Z-direction adjusting screws 104 to 106 is adjusted so that the imaging surface 103b is positioned optically equivalent to the original image formation surface of the film by the photographing lens 1. . In the state adjusted in this way, the Z-direction adjusting screws 104 to 106 are fixed to the image sensor holding plate 102 with an adhesive or the like, for example.

  As described above, the upper side surface of the positioning convex portion 102a functions as the Y positioning portion 102b. The Y lever 107 is provided so that its end 107a protrudes toward the camera body 2 through the hole 102d of the image sensor holding plate 102, and the image sensor holding plate is parallel to the X direction by the shaft 107b. It is pivotally supported with respect to 102. Further, the Y lever 107 has a standing bent portion 107 c and is given a right turning force by the torsion spring 108. However, when the convex portion 107d of the Y lever 107 abuts on the upper portion of the hole portion 102d of the image sensor holding plate 102, the Y lever 107 is restricted in the clockwise rotation, and the convex portion 107d abuts on the upper portion of the hole portion 102d. Held in position.

  One end of the leaf spring 109 is fixed to the camera back main body 101a of the electronic camera back 101, and the other end is held so as to be positioned between the camera back main body 101a and the bent portion 107c of the Y lever 107. Yes.

  The conical coil spring 110 has a large coil diameter side fixed to the camera back body 101 a and a small coil diameter side fixed to the image sensor holding plate 102. The conical coil spring 110 urges the image sensor holding plate 102 in a direction parallel to the Z direction and toward the camera body 2, but also has a degree of freedom of movement in the XY directions. Therefore, the image sensor holding plate 102 is held by the camera back body 101a by the conical coil spring 110 while having a degree of freedom of movement in the XYZ directions with respect to the camera back body 101a.

  FIG. 7 is a cross-sectional view of the electronic camera back 101 according to the present embodiment taken along a cross section BB shown in FIG. As described above, the left side surface of the positioning convex portion 102a functions as the X positioning portion 102c. The X lever 117 is provided so that an end portion 117a of the X lever 117 protrudes toward the camera body 2 through the hole portion 102e of the image sensor holding plate 102, and the shaft 117b is connected to the image sensor holding plate 102 along an axis parallel to the Y direction. On the other hand, it is rotatably supported. Further, the X lever 117 has a standing bent portion 117 c and is given a left-handed turning force by a torsion spring 118. However, when the convex portion 117d of the X lever 117 comes into contact with the left portion of the hole portion 102e of the image sensor holding plate 102, the X lever 117 is restricted from turning counterclockwise, and the convex portion 117d contacts the left portion of the hole portion 102e. It is held at the contact position.

  One end of the leaf spring 119 is fixed to the camera back main body 101a of the electronic camera back 101, and the other end is held so as to be positioned between the camera back main body 101a and the bent portion 117c of the X lever 117. Yes.

  Next, an operation when the electronic camera back 101 is attached to the camera body 2 will be described. When the electronic camera back 101 mounted on the camera body 2 is closed by using the attaching / detaching mechanism by the hinge 17 described above, the back cover key 16 is engaged with the back cover key 13 on the camera body 2 side, and the electronic camera back 101 is closed. It is held in the state. In this state, the light tightness of the camera body 2 is maintained.

  FIG. 8 shows a cross-sectional view taken along the same cross-section (cross-section AA shown in FIG. 5) as FIG. 6 with the electronic camera back 101 closed as described above. When the electronic camera back 101 is closed, the tip of the Z-direction adjusting screw 104 comes into contact with the inner rail 10a of the camera body 2, and the tips of the Z-direction adjusting screws 105 and 106 come into contact with the inner rail 10b of the camera body 2, respectively. . Note that the Z-direction adjusting screw 105 is not shown in FIG.

  In this way, with the electronic camera back 101 closed and the Z-direction adjusting screws 104 to 106 in contact with the inner rails 10a and 10b, the image sensor holding plate 102 and the camera back main body 101a are brought close to each other and the conical coil spring 110 is bent. It is configured as follows. As a result, the conical coil spring 110 applies a pressing force against the inner rails 10a and 10b to the image sensor holding plate 102, so that a stable contact state between the Z-direction adjusting screws 104 to 106 and the inner rails 10a and 10b is maintained. The

  As described above, the virtual plane formed by the tips of the Z-direction adjusting screws 104 to 106 is made to coincide with the virtual plane formed by the inner rails 10a and 10b of the camera body 2 (that is, the surface on which the film is fed). The amount of protrusion of the tips of the Z-direction adjusting screws 104 to 106 is adjusted in advance so that the imaging surface 103b is positioned optically equivalent to the original imaging surface of the film by the photographic lens 1. Yes. Therefore, when the tips of the Z-direction adjusting screws 104 to 106 come into contact with the inner rails 10 a and 10 b, the imaging surface 103 b is installed at a position optically equivalent to the original imaging surface of the film by the photographing lens 1. In this state, the image sensor 103 is positioned. That is, the image sensor 103 is appropriately positioned with respect to the photographing lens 1 in the Z direction, the yawing direction, and the pitching direction.

  When the electronic camera back 101 is closed, the Y positioning portion 102 b and the end portion 107 a of the Y lever 107 enter the opening 11 of the camera body 2. At this time, the sizes of the Y positioning portion 102b and the Y lever 107 are determined in advance so that the Y positioning portion 102b and the end portion 107a of the Y lever 107 do not hinder the movement of the shutter curtain.

  As described above, the camera back main body 101a and the image sensor holding plate 102 approach each other, so that the leaf spring 109 comes into contact with the standing bent portion 107c of the Y lever 107. Here, since the counterclockwise force of the leaf spring 109 with respect to the Y lever 107 is configured to be larger than the clockwise force of the torsion spring 108, the counterclockwise force of the leaf spring 109 causes the Y lever 107 to rotate counterclockwise. As a result, the end 107 a of the Y lever 107 abuts on the lower side 11 b of the opening 11 to urge the image sensor holding plate 102 upward, and the Y positioning portion 102 b of the image sensor holding plate 102 is moved toward the opening 11. It abuts on the upper side 11a. After this contact, the leaf spring 109 is bent to prevent overload at each contact portion.

  FIG. 9 shows a cross-sectional view taken along the same cross section (cross section BB shown in FIG. 5) as FIG. When the electronic camera back 101 is closed, the X positioning portion 102 c and the end portion 117 a of the X lever 117 enter the opening 11 of the camera body 2. At this time, the sizes of the X positioning portion 102c and the X lever 117 are determined in advance so that the X positioning portion 102c and the end portion 117a of the X lever 117 do not hinder the movement of the shutter curtain.

  As described above, when the camera back main body 101a and the image sensor holding plate 102 come closer, the leaf spring 119 comes into contact with the standing bent portion 117c of the X lever 117. Here, the right turning force of the leaf spring 119 with respect to the X lever 117 is configured to be larger than the left turning force of the torsion spring 118, so that the right turning force of the leaf spring 119 causes the X lever 117 to turn right. As a result, the end portion 117 a of the X lever 117 abuts on the right side 11 d of the opening 11 to urge the image sensor holding plate 102 to the left, and the X positioning portion 102 c of the image sensor holding plate 102 is moved to the opening 11. It abuts on the left side 11c. After this contact, the leaf spring 119 bends to prevent overload at each contact portion.

  As described above, the image sensor 103 is attached to the photographing holding plate 102 in a state where the image sensor holding plate 102 is positioned, the pixel arrangement direction is parallel to the XY direction of the camera body 2, and the predetermined position on the image pickup surface 103b. Is adjusted in advance so as to coincide with the optical axis of the photographing lens 1. Accordingly, when the Y positioning portion 102b is urged and abuts against the upper side 11a of the opening 11, and the X positioning portion 102c is urged and abuts against the left side 11c of the opening 11, the imaging element 103 is The predetermined position of 103b and the optical axis of the imaging lens 1 coincide with each other, and the pixel arrangement direction of the imaging surface 103b is positioned parallel to the XY direction of the camera body 2. That is, the image sensor 103 is appropriately positioned with respect to the photographing lens 1 in the X direction, the Y direction, and the rolling direction.

  The pressing force by the conical coil spring 110 includes a frictional force caused by contact between the upper side 11a of the opening 11 and the Y positioning portion 102b, and a frictional force caused by contact between the lower side 11b of the opening 11 and the end 107a of the Y lever 107. The frictional force due to the contact between the left side 11c of the opening 11 and the X positioning portion 102c and the frictional force due to the contact between the right side 11d of the opening 11 and the end 117a of the X lever 117 are larger than the sum. It is configured. As a result, the Z-direction adjusting screw 104 reliably contacts the inner rail 10a, and the Z-direction adjusting screws 105 and 106 securely contact the inner rail 10b.

According to the embodiment described above, the following operational effects can be obtained.
(1) The electronic camera back 101 is attached to the camera body 2 with a hinge 17 and a back cover key 16 for being detachably attached to the camera body 2, and the hinge 17 and the back cover key 16. An image pickup element 103 that picks up an image of a subject by the photographing lens 1 on the side and outputs an image signal; an image pickup element holding plate 102 to which the image pickup element 103 is fixed; a positioning convex portion 102a provided on the image pickup element holding plate 102; Since the Y lever 107 and the leaf spring 109 for urging the positioning projection 102a to contact the upper side 11a of the opening 11 are provided, the camera is not intended to be mounted with the electronic camera back 101. Even when combined, the image sensor 103 can be positioned with respect to the photographing optical system (the photographing lens 1) on the camera body 2 side with a simple configuration. .

(2) The electronic camera back 101 of the above (1) further includes an X lever 117 and a leaf spring 119 that bias the positioning convex portion 102a so as to abut on the left side 11c intersecting the upper side 11a of the opening 11. Since configured, the image sensor 103 can be positioned in the X direction in addition to the Y direction of the camera body 2.

(3) In the electronic camera back 101 of (2) above, the Y lever 107 and the leaf spring 109 are attached so that the upper side surface (Y positioning portion 102b) of the positioning convex portion 102a is brought into contact with the upper side 11a of the opening 11. Therefore, the image sensor 103 can be positioned in the rolling direction in addition to the X direction and the Y direction of the camera body 2.

(4) In the electronic camera back 101 of (3) above, the X lever 117 and the leaf spring 119 are in contact with the left side 11c of the opening 11 on the left side (X positioning part 102b) different from the upper side of the positioning convex part 102a. Therefore, the image sensor 103 can be accurately positioned in the X direction, the Y direction, and the rolling direction of the camera body 2.

(5) In the electronic camera back 101 of the above (3) or (4), the upper side 11a of the opening 11 is longer than the left side 11c, and the portion (Y positioning portion 102b) of the positioning convex portion 102 that contacts the upper side 11a. Since the length is configured to be longer than the length of the portion (X positioning portion 102c) that abuts on the left side 11c, the image sensor 103 is accurately connected to the photographing optical system (the photographing lens 1) on the camera body 2 side. Can be positioned.

(6) In the electronic camera back 101 of the above (1) to (5), the inner rails 10 a and 10 b provided on the camera body 2 are brought into contact, and the inner rails 10 a and 10 b and the imaging surface 103 b of the imaging element 103 are Since the Z-direction adjusting screws 104, 105, and 106 that hold the gaps at a predetermined distance are further provided, the camera body 2 has the Z direction (the optical axis direction of the photographing lens 1), the pitching direction, and the yawing direction. The image sensor 103 can be positioned.

(Modification 1)
Instead of the torsion springs 108 and 118 described above, the Y lever 107 and the X lever 117 may be biased by using, for example, a coil spring or a leaf spring.

(Modification 2)
As a configuration for biasing the Y lever 107 and the X lever 117 when the electronic camera back 101 is closed with respect to the camera body 2, for example, a coil spring or the like may be used instead of the plate springs 109 and 119 described above. .

(Modification 3)
Instead of the Y lever 107 and the leaf spring 109 described above, a biasing force that abuts the Y positioning portion 102b against the upper side 11a of the opening 11 may be generated by a magnetic force such as a magnet. Similarly, instead of the X lever 107 and the leaf spring 119 described above, a biasing force that causes the X positioning portion 102c to come into contact with the left side 11c of the opening 11 may be generated by a magnetic force such as a magnet.

  The above description is merely an example, and is not limited to the configuration of the above embodiment.

DESCRIPTION OF SYMBOLS 1 ... Shooting lens 2 ... Camera body 3 ... Release button 7 ... Back cover 10a, 10b ... Inner rail 11 ... Opening part 16 ... Back cover key 17 ... Hinge 101 ... Electronic camera back 102 ... Imaging element holding plate 102a ... Positioning convex part 103 ... Image sensor 104, 105, 106 ... Z direction adjusting screw 107 ... Y lever 108, 118 ... Torsion spring 109, 119 ... Leaf spring 110 ... Conical coil spring 117 ... X lever

Claims (8)

In the electronic camera back that is attached to the camera body,
In a state of being mounted on the camera body, and an imaging device that captures a subject image formed by light passing through the rectangular opening of the camera body,
A fixing portion for fixing the image sensor;
A positioning portion provided in the fixed portion ;
A camera back portion disposed at a distance from the fixed portion;
A first urging portion that urges the positioning portion so as to contact the first side of the opening, and the urging force increases as the distance between the fixing portion and the camera back portion decreases. ,
With electronic camera back. The electronic camera back according to claim 1,
An electronic camera back provided with a first elastic part that increases an elastic force when a distance between the fixing part and the camera back part is narrowed and increases an urging force of the first urging part. The electronic camera back according to claim 1 or 2 ,
Biasing the positioning portion to contact the second side of the opening, a second biasing portion which force is increased to urge accordance distance between the camera back portion and the fixing portion is narrowed Electronic camera back equipped. The electronic camera back according to claim 3,
An electronic camera back provided with a second elastic portion that increases an elastic force when a distance between the fixing portion and the camera back portion becomes narrow, and increases a force applied by the second urging portion. The electronic camera back according to claim 3 or 4 ,
The first biasing portion, an electronic camera back for urging the first surface of the positioning portion so as to be in contact with the first side of the opening. The electronic camera back according to claim 5 ,
The second biasing portion, an electronic camera back for urging said first surface is different from a second surface of the positioning portion so as to contact with the second side of the opening. The electronic camera back according to claim 5 or 6 ,
Site length of the first side of the opening is longer than a length of the second side, the length of the portion in contact with the first side at the positioning portion is in contact with the second side Electronic camera back longer than the length of. In the electronic camera back according to any one of claims 1 to 7 ,
The camera in contact with the film guide member provided in the body, said film guide member and the electronic camera back between the imaging surface comprises a holder for holding to a predetermined distance of the image sensor.

Images