JPH0572618A - Lens mount structure - Google Patents

Abstract

PURPOSE:To perform the final adjustment of optical focusing without detaching the internal parts of a television camera and to make lens mount structure compact. CONSTITUTION:Slits 3a are plurally formed in parallel with the axial center of a lens in a mount holding part 3 provided on the front surface of the housing 2 of the television camera. A tapered screw is chased on the outer periphery of the holding part 3 and a fixing ring 11 is screwed there. Focusing is adjusted by rotating a lens mount 5 in a state where the fixing ring 4 is loosened. By tightening the fixed ring after adjustment, the lens mount 5 is fixed on the inner periphery of the holding part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens mount for a television camera using a solid-state image pickup element, and more particularly to a lens mount structure suitable for a focus adjusting mechanism.

[0002]

2. Description of the Related Art As a conventional optical final focus adjusting mechanism in a television camera using a solid-state image pickup device, there is a structure shown in FIG. this is,
The optical final focus is adjusted by changing the thickness of the adjustment plate 27 for focus adjustment provided on the television camera housing 22 using the solid-state imaging device 26.

Further, as shown in FIG. 4, the solid-state image pickup device 2
6 is provided with a substantially cylindrical mount holding portion 33 in the front portion of a television camera housing 32, and a focus ring 37 is fixed in the mount holding portion 33.
There is a focus adjustment mechanism that rotatably provides a lens mount 35 that engages with the lens mount 35, and adjusts the optical final focus by rotating the lens mount 35. In this case, the lens mount 35 is fixed by fastening the fixing screw 38 to the slit 33a provided on the lower side of the mount holding portion 33, as shown in FIG.

[0004]

However, the focus adjusting mechanism shown in FIG. 3 has a problem that the focus cannot be adjusted without attaching or detaching the internal parts of the television camera. In this respect, the focus adjustment mechanism shown in FIG.
By rotating the lens mount 35, adjustments can be made from the outside without removing parts, but there is a problem in that the mounting portion of the fixing screw 38 of the mount holding portion 33 sticks out, which violates the demand for downsizing and weight saving of the television camera. is there.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lens mount structure in which the optical final focus can be adjusted without removing the internal parts of a television camera and which is compact. To do.

[0006]

In order to achieve the above object, the present invention provides a lens mount structure in which a lens mount is held by a holding portion provided on the front surface of a television camera housing, and the lens axis is provided in the holding portion. A plurality of slits parallel to the holding part, and a tapering male screw is cut on the outer circumference of the holding part to screw the fixing ring into the holding part so that the holding part can be adjusted in the radial direction, and an internal thread is formed on the inner circumference of the holding part. Is cut and the lens mount is screwed to adjust its position.

[0007]

In the present invention configured as described above, when the fixing ring is loosened, the fixing of the lens mount by the holding portion is released, and the lens mount is rotated to adjust the focus. The lens mount is fixed by the holding unit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a lens mount structure 1 of this embodiment.
Indicates. This lens mount structure 1 has a substantially cylindrical mount holding portion 3 protruding from the front surface of a TV camera housing 2.
And a fixing ring 4 screwed onto the outer circumference of the mount holding portion 3 and a lens mount 5 screwed onto the inner circumference of the mount holding portion 3. Reference numeral 6 in the figure is a solid-state image sensor.

As shown in FIG. 2, the mount holding portion 3 is provided with four slits 3a parallel to the lens axis and having a central angle of 90 °, whereby the mount holding portion 3 is radially reduced. It is possible. In addition, a female screw into which the lens mount 5 is screwed is cut rightward on the inner circumference of the mount holding portion 3, and when the lens mount 5 is turned to the right, it approaches the solid-state image sensor 6, and when turned to the left, it moves away from it. The focus can be adjusted by. Further, a tapered male screw threaded with the fixing ring 4 is cut on the outer periphery of the mount holding portion 3, and when the fixing ring 4 is tightened, the slit 3a is narrowed and the mount holding portion 3 fixes the lens mount 5. When the fixing ring 4 is loosened, the mount holding portion 3 releases the lens mount 5 so that it can rotate.

It should be noted that the fixing ring 4 can be made thin without any protruding portion, and the outer periphery thereof is provided with irregularities so that it can be rotated easily. The operation of the lens mount structure 1 having the configuration described above is performed in order to adjust the focus.
First, the fixing ring 4 is loosened, and then the lens mount 5 is rotated to perform focus adjustment. After this focus adjustment, the fixing ring 4 is tightened again, and the lens mount 5 is fixed, and then the process ends.

In the above embodiment, the slit 3a of the holding portion is used.
Although four are provided, it is only necessary to ensure the diameter reducing operation of the holding portion 3 necessary for fixing the lens mount 5, and therefore the number can be set to any number as long as it is two or more.

[0012]

As described above, according to the present invention, the final adjustment of the optical focus can be performed by rotating the lens mount from the outside without removing the internal parts of the television camera. Further, the fixing ring is also small and lightweight, and the entire structure can be made compact.

[Brief description of drawings]

FIG. 1 is a sectional view showing a lens mount structure of the present embodiment.

FIG. 2 is a side view showing the same holding unit.

FIG. 3 is a cross-sectional view showing a conventional example.

FIG. 4 is a cross-sectional view showing another conventional example.

5 is a cross-sectional view showing a cross section taken along the line AA of FIG.

[Explanation of symbols]

 1 Lens mount structure 3 Holding part 4 Fixing ring 5 Lens mount

Claims (1)

[Claims] 1. A lens mount structure in which a lens mount is held by a holding portion provided on the front surface of a television camera housing, wherein the holding portion is provided with a plurality of slits parallel to the lens axis, and the holding portion has a plurality of slits. A tapered male screw is cut on the outer circumference to screw the fixing ring into the holder so that the holding portion can be adjusted in the radial direction, and a female screw is cut to the inner circumference of the holding portion so that the lens mount can be screwed into position. A lens mount structure that is characterized by that.