JPH02177671A - Lens interchangeable video camera - Google Patents

Abstract

PURPOSE:To readjust a flange back from the outside even after the video camera is completed by providing an adjusting member to move and adjust a holding member to integrally hold an image pickup element and an optical member in an optical axis direction for a lens interchanging mount. CONSTITUTION:When an adjusting member 10 is rotated in the direction of an arrow A while either a tool is inserted into, for example, an insertion hole 10a of the adjusting member 10 from the front of the camera or the bore surface of the adjusting member 10 is pressed, the adjusting member 10 moves in the optical axis direction by the lead of a screw combination, a holding member 6 advances straight in the optical axis direction, which is the direction of an arrow B, and the flange back can be finely adjusted. In this manner, the flange back can be adjusted by rotating the adjusting member 10 combined to a mount base member 2, which has a fixed relation to a mounting member 1, with a screw. Thus, the flange back can be finely adjusted with high accuracy by the lead of the screw combination, and the flange back can be readjusted from the outside even after the video camera is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video camera with interchangeable lenses, and more particularly to a video camera equipped with a flange/back adjustment mechanism.

[Conventional technology]

In conventional video cameras with interchangeable lenses, the so-called flange back adjustment from the mount surface on which the interchangeable lens is attached to the imaging surface can be done by inserting an adjustment washer into the mounting surface of the mount member, or by adjusting the flange back before assembling the camera. In the process, adjustment was required by displacing the imaging member in the optical axis direction using a plurality of screws from the rear. Therefore, highly accurate flange and back adjustment was difficult, and readjustment (fine adjustment) after the camera was completed was almost impossible.

[Problem to be solved by the invention] As mentioned above (,
In conventional interchangeable lens video cameras, the flange back adjustment from the mount surface to the focus surface was extremely difficult, and it was impossible to adjust with high precision. Interchangeable lens cameras are not common, and in the case of interchangeable lens cameras for professional use, the current situation is that the user corrects flange and back errors by finely adjusting the focus on the lens side.However, In a video camera system that allows multiple lenses and bodies to be freely combined without adjustment, it is necessary to adjust the flange back to about ±0.02. The present invention provides a structure that not only improves accuracy but also allows readjustment from the outside even after the camera assembly is completed.

[Means for solving problems]

The present invention provides a holding member that integrally holds an image sensor such as a COD and an optical member such as a filter located in front of the optical axis of the image sensor, supports this holding member so as to be movable in the optical axis direction, In addition, the present invention is characterized by a video camera having an interchangeable lens, which is provided with an adjustment member for moving and adjusting the holding member in the optical axis direction with respect to the lens exchange mount.

〔Example〕

1 and 2 show a first embodiment of the present invention, FIG. 1 is a perspective view showing the main parts of a video camera lens exchange mount, and the second embodiment is a cross-sectional view of the same thing. It is a diagram.

In the figure, l is a mount member having a mount reference surface 1a, and in this example, a screw type mount is shown.
A bayonet type may also be used.

The mount member 1 is fixed to a mount base member 2, and is fixed to another camera body (not shown). 3 is C
An image sensor such as a CD, 4 a mounting board to which the image sensor 3 is attached, 5 an optical member such as a low-pass filter and an IR cut filter, and the image sensor 3, optical member 5, etc.
It is integrally held by a holding member 6. Specifically, the first
The optical member 5 is attached to the attachment part 6a, and the second attachment part 6b
A mounting board 4 to which an image sensor 3 is fixed is attached.

The holding member 6 engages with the base member 2 so as to be displaceable in the optical axis direction. That is, the cylindrical outer diameter portion 6C of the holding member 6 is fitted into the cylindrical inner diameter portion 2a of the base member 2 so as to be movable in the optical axis direction. At this time, a guide shaft 8 fixed integrally with the holding member 2 is inserted into a guide hole 7 attached to the rear end of the mount base member 2 to restrict rotation of the holding member 6 and Only straight-line travel is permitted. A female screw portion 9 is attached to the inner diameter portion of the front surface of the mount base member 2, and an adjustment member l for adjusting the flange back is attached to the female screw portion 9.
The outer circumferential threaded portion 11 of O is engaged. Reference numeral 12 denotes a plurality of spring members, one end of which is locked to the holding member 6 and the other end to the mount base member 2. As if touching (
, the holding member 6 is constantly urged in the optical axis direction. Specifically, the holding member 6 is urged against the mount base member 2 in the direction of arrow X. To adjust the flange back of this video camera, the adjustment member 10 is inserted into the insertion hole 10a with a tool (not shown) from the front of the camera, or by pressing the inner diameter surface of the adjustment member 10 in the direction of arrow A in FIG. By rotating the adjustment member 10 in the direction of the optical axis by means of the threaded lead, the holding member 6 moves in the direction of the arrow B.
The lens moves straight in the direction of the optical axis, allowing fine adjustment of the flange back.

In FIG. 1, reference numeral 20 denotes an interchangeable lens, which is mounted by screwing the mount screw part 20a of the lens side mount to the mount screw part 1b of the video camera side.

According to the first embodiment described above, the flange/knock can be adjusted by rotating the adjustment member 10 screwed to the mount base member 2 which is fixed to the mount member l. Highly accurate fine adjustment is possible using the coupling lead, and it also has the effect of allowing readjustment from the outside even after the video camera is completed.

After completing the flange back adjustment, fix the adjustment member IO using adhesive or other fixing methods.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. Note that the same components as in the first embodiment described above are designated by the same reference numerals.

The characteristic feature of the second embodiment is that the mount base member 2
A male thread 13 is attached to the outer periphery on the rear side of the optical axis, and an inner thread 1 of the adjustment member 14 for flange back adjustment is attached to this.
5 meshes. The adjustment member 14 rotates around the optical axis, and has a contact portion 14a that contacts the holding member 6.
Furthermore, a gear portion 16 is formed. The mount base member 2 is provided with the gear portion 1 at a position offset from the center of the optical axis.
A transmission wheel 17 meshing with the transmission wheel 6 is rotatably supported.

Further, a tool hole 18 is provided in the mount base member 2 to expose at least the tooth region of the transmission wheel. In the figure, 19 is a cover that can be easily attached, and by removing this cover 19, the tool hole 18 is exposed.

The adjustment of the flange back in the second embodiment is performed by removing the cover 19, inserting a tool having a gear into the tool hole 18, rotating the transmission wheel 17, and rotating the adjusting member 14. It will be done. When the adjustment member 14 is rotated, it is displaced in the optical axis direction by the threaded lead, and the holding member 6 is displaced in the optical axis direction with respect to the mount base member 2, thereby adjusting the flange back.

In this second embodiment, an interchangeable lens 2 is used for the video camera.
The fact that the flange back can be finely adjusted with the 0 mounted is an additional effect over the first embodiment described above.

Incidentally, the position of the tool hole 18 is, of course, set to a position that is shifted outward from the lens outer diameter when the interchangeable lens 20 is attached to the video camera, and is also set to a position that is shifted outward from the outer diameter of the lens when the interchangeable lens 20 is attached to the video camera. It is set.

[Modification of the present invention]

In the first and second embodiments described above, the spring-loaded member 12 is set in a direction that draws the holding member 6 toward the mount base member 2, but it is also possible to set it in a direction that draws the holding member 6 away from each other.

Further, although the adjusting member 1O is arranged with the center of the optical axis as the center of rotation, it can also be set as the center of rotation at a position offset from the center of the optical axis.

〔Effect of the invention〕

As described above, the present invention can provide a video camera with interchangeable lenses in which the flange and back can be readjusted from the outside even after the video camera is completed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of a mount portion of a video camera according to a first embodiment of the present invention. FIG. 2 is a sectional view of FIG. 1. FIG. 3 is a perspective view of a main part of a mount portion of a video camera according to a second embodiment of the present invention. FIG. 4 is a sectional view of FIG. 3.

Claims (5)

[Claims] (1) In a video camera having an interchangeable lens mount, a holding member that integrally holds an image sensor and an optical member located in front of the optical axis of the image sensor is provided, and the holding member is supported movably in the optical axis direction. A video camera with interchangeable lenses, further comprising an adjusting member for adjusting the movement of the holding member in the optical axis direction with respect to the lens interchangeable mount. (2) The holding member is supported movably only in the optical axis direction with respect to a mount base member that is in a fixed relationship with the lens exchange mount, and is elastically attached to the mount base member in the optical axis direction by an elastic member. Further, an adjusting member screwed to the base member is provided on the side of the holding member in the direction of elastic biasing by the elastic member, and the holding member comes into contact when the position changes in the optical axis direction due to rotational adjustment of the adjusting member. A video camera with interchangeable lenses according to claim 1, wherein the flange back adjustment is performed by changing the position of the member in the optical axis direction. (3) The holding member is supported so as to be movable only in the optical axis direction with respect to a mount base member that is in a fixed relationship with the lens exchange mount, and is elastically attached to the mount base member in the optical axis direction by an elastic member. Further, an adjustment member having a contact portion with the holding member on the side in the direction of elastic biasing by the elastic member is screwed to the mount base member, and the position in the optical axis direction is changed by rotation adjustment of the adjustment member. The video camera with interchangeable lenses according to claim 1, wherein the flange back adjustment is performed by displacing the position of the holding member in the optical axis direction. (4) The lens-interchangeable video camera according to claim 1, wherein the adjusting member is rotated around the optical axis. (5) The adjusting member is provided with a gear portion, further provided with a transmission member having a gear portion that meshes with the gear portion, and an opening that allows the transmission member to be rotated from the direction of the lens exchange mount of the video camera. A video camera with interchangeable lenses according to claim (4).