JPH0733071U - Image sensor holding device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is easy to maintain the state where the optical center of the image sensor coincides with the optical axis of the lens held in the lens mount in the device for holding the image sensor that performs flange back of the lens and focus adjustment In addition, reduce the number of parts and downsize. A lens mount for holding a lens unit, a holding member for holding an image pickup element, the holding member having a plurality of first inclined surfaces inclined in a circumferential direction about an optical axis of the lens unit, the lens mount and the A rod member provided between the holding members so as to be rotatable about the optical axis and having a plurality of second inclined surfaces that are in contact with the plurality of first inclined surfaces and incline in a direction opposite to the circumferential direction; A leaf spring member is provided which holds the holding member so as to be movable in the optical axis direction and non-rotatable about the optical axis, and presses the lens mount together with the rod member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for holding an image sensor, which uses an image sensor and has a lens flange back and a focus adjustment mechanism in a video camera or the like with interchangeable lenses.

[0002]

[Prior art]

 As a conventional holding device, there is a holding device as disclosed in Japanese Utility Model Publication No. 1-178494 (H04N 5/225). FIG. 2 shows a device for holding an image sensor according to the present invention. The mounting screws 24, 24, 24 are screwed in from the front of the lens mount 25 and firmly fastened so as not to loosen, and the imaging element 4 is held against the bolts of the mounting screws 24, 24, 24. The bracket 22 is attached. That is, the adjusting nuts 27, 27, 27 are inserted into the bolt insertion holes 22a, 22a, 22a formed in the bracket 22, and the coil springs 26, 26, 26 are inserted into the bolts between the lens mount 25 and the bracket 22. , The bracket 22 is attached, and the adjusting nuts 27, 27, 27 are screwed in. In addition, 21 is a solid-state image sensor, 23 is a printed circuit board, 28 and 28 are screws for attaching the bracket 22 to the printed circuit board 23.

[0003]

[Problems to be solved by the device]

 However, in order to adjust the lens flange back and the focus with the holding device, that is, in order to adjust the distance between the lens mount 25 and the solid-state imaging device 21, the lens mount 25 is moved in the optical axis direction of the solid-state imaging device 21. It has to be translated. For that purpose, it is necessary to adjust the screwing amounts of the three adjusting nuts 27, 27, 27 so that the optical center of the solid-state imaging device 21 and the optical axis of the lens held by the lens mount 25 are kept in alignment with each other. It has never been so easy.

The present invention is a device for holding an image sensor, which adjusts the lens flange back and the focus, and maintains the optical center of the image sensor and the optical axis of the lens held by the lens mount in alignment with each other. The purpose is to make it easier, reduce the number of parts, and downsize.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention, as a holding device for an image pickup device, holds a lens mount for holding a lens unit and an image pickup device, which is tilted in a circumferential direction about the optical axis of the lens unit. A holding member having a plurality of first slopes, rotatably provided around the optical axis between the lens mount and the holding member, and in contact with the plurality of first slopes and in the circumferential direction. A rod member having a plurality of second inclined surfaces inclined in the opposite direction, and a holding member that is movable in the optical axis direction and non-rotatable about the optical axis and is used together with the rod member. And a leaf spring member for pressing the lens mount.

[0006]

[Action]

 When the rod member rotates about the optical axis of the lens unit, the holding member is moved by the rod action by the plurality of first slopes provided on the holding member and the plurality of second slopes provided on the rod member. Move in the axial direction.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a holding device for an image sensor according to an embodiment of the present invention. In the figure, a lens unit 1 is fixed to a lens mount 2. Further, the lens mount 2 is provided with a circular guide portion 2a centered on the optical axis 3 of the lens unit 1 on the surface opposite to the side on which the lens unit 1 is fixed.

On the other hand, the holding member 5 that holds the image pickup device 4 is provided with a plurality of first inclined surfaces 5 a, 5 a, 5 a that are inclined in the circumferential direction about the optical axis 3. The image pickup device 4 is fixed to the holding member 5 together with the spacer 6 and the image pickup device mounter 7 by screws 8 and 8. At this time, the image pickup element 4 is precisely regulated in position by the projection 5b and the wall surface 5c of the holding member 5.

The outer peripheral portion 9 a of the rod member 9 which is rotatably held about the optical axis 3 has a circular shape about the optical axis 3 and is added along the guide portion 2 a of the lens mount 2. Is being worked on. Further, the rod member 9 is provided with a slit portion 9b into which the eccentric pin 10a of the adjusting member 10 for rotating the rod member 9 about the optical axis 3 is inserted, and the adjusting member 10 is rotated. As a result, the eccentric pin 10a acts on the slit portion 9b, and the rod member 9 rotates about the optical axis 3. Further, the rod member 9 has a circular guide portion 9c having the optical axis 3 as a center, and a plurality of second inclined surfaces 5a, 5a, 5a provided on the holding member 5 which are inclined in the opposite direction. Slopes 9d, 9d, 9d are provided. The holding member 5 and the rod member 9 are held by the leaf spring 11 described later so that the first slopes 5a, 5a, 5a and the second slopes 9d, 9d, 9d are in contact with each other.

That is, the guide portion 2a of the lens mount 2 and the outer peripheral portion 9a of the rod member 9 are along, the guide portion 9c of the rod member 9 and the outer peripheral portion 5d of the holding member 5 are along, and each guide portion and the outer peripheral portion are Since the center coincides with the optical axis 3 of the lens unit 1, if the protrusion 5b and the wall surface 5c of the holding member 5 are properly determined, the optical center of the image pickup element 4 and the optical axis 3 will be the same as those of the rod member 9. It can be matched regardless of movement.

Further, the leaf spring 11 has bent portions 11 a and 11 a that press down the protrusions 5 e and 5 e provided on the holding member 5, and also has a cutout portion 11 b that extends along the outer periphery of the adjustment member 10. Further, the fixing holes 11c, 11c, 11c of the leaf spring 11, the through holes 12a, 12a, 12a of the chassis 12 and the screw holes 2b, 2b, 2b of the lens mount 2 are aligned with each other. Therefore, the lens mount 2 and the leaf spring 11 are fixed with the screws 13, 13, and at the same time, the holding member holding the rod member 9, the adjusting member 10 inserted into the through hole 12b provided in the chassis 12, and the image pickup element 4 is held. The member 5 can also be fixed. When the leaf spring 11 is fixed to the lens mount 2, the protrusions 5e and 5e of the holding member 5 are pressed by the bent portions 11a and 11a of the leaf spring 11, so that the holding member 5 is centered on the optical axis 3. Never rotate.

From the above, by rotating the adjusting member 10 from the outside of the device for holding the image pickup device, the image pickup device 4 is aligned on the optical axis 3 of the lens unit 1 with its optical center aligned with the optical axis 3. It can be moved back and forth in parallel and without rotating. Therefore, by stopping the rotation of the adjusting member 10 and fixing it, the position of the image pickup device 4 can be fixed at a desired position with respect to the lens unit 1, and as a result, the flange back adjustment and the focus adjustment of the lens unit 1 can be performed. Is possible.

In the above embodiments, the lens mount 2 and the chassis 12 are separate components. In this case, although the number of parts increases, when the lens unit 1 is fixed to the lens mount 2 by screwing, the screw start position of the lens mount 2 is restricted, that is, the rotational positioning after the lens unit 1 is fixed. This is particularly advantageous when the iris control of the lens unit 1 is performed electrically, there is a cord, and the lens unit 1 itself does not have a mechanism for adjusting the rotational position. If the rotational positioning accuracy of the lens unit 1 itself is not required, the lens mount 2 and the chassis 12 can be formed by die casting or the like, and can be made into one component.

Further, in the embodiment, the circular guides 2a and 9c centering on the optical axis 3 of the lens unit 1 are provided with guide shapes inward, which is advantageous for downsizing. However, functionally, it is also possible to provide a guide shape on the outer side or form each groove with the same size as each guide.

Further, the shapes of the bent portions 11a, 11a of the leaf spring 11 and the protrusions 5e, 5e of the holding member 5 are not limited to those in the present embodiment, and for example, the first slopes 5a, 5a of the holding member 5 may be formed. The leaf spring 11 may be deformed so as to press it from the direction opposite to the slope of the convex portion forming 5a. Further, the adjusting member 10 is not limited to be inserted from the lateral direction as in this embodiment, and may be configured to be inserted from above or below.

[0016]

[Effect of device]

 According to the present invention, it is possible to easily maintain a state in which the optical center of the image pickup element and the optical axis of the lens held by the lens mount are aligned with each other without requiring a large number of parts with dimensional accuracy, and the number of parts is reduced. It is possible to provide a holding device that can be reduced in number and downsized, and the effect thereof is great.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a conventional technique.

[Explanation of symbols]

 2 lens mount 4 image sensor 5 holding member 5a, 5a, 5a first inclined surface 9 rod member 9d, 9d, 9d second inclined surface 11 leaf spring

Claims (1)

[Scope of utility model registration request] 1. A lens mount for holding a lens unit, a holding member for holding an image pickup element, the holding member having a plurality of first inclined surfaces inclined in a circumferential direction about an optical axis of the lens unit, and the lens mount. And a holding member that is rotatably provided about the optical axis and that has a plurality of second slopes that are in contact with the plurality of first slopes and incline in a direction opposite to the circumferential direction. And a leaf spring member that holds the holding member so as to be movable in the optical axis direction and non-rotatable about the optical axis, and presses the lens mount together with the rod member. A holding device for a characteristic image pickup device.