JPH0524904Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a mechanism for attaching a lens filter to a monitor television camera or the like.

(Prior art) Conventionally, as a structure for attaching a lens filter to the lens of a monitor television camera, etc., a filter holder is inserted inside the cylindrical projection of the lens unit, and the filter holder is attached with a screw from the outside of the cylindrical projection. There was a structure in which the screws were screwed together (for example, see Japanese Patent Application Laid-open No. 160382/1982).

(Problem that the invention aims to solve) However, with this structure, when trying to remove the lens unit attached to the camera body,
If the screws are not removed from the inside of the camera case in advance by, for example, opening the device case, the screws will get caught in the camera body case. Therefore, when changing lenses, maintaining or replacing filters, etc., it is necessary to remove screws from inside the camera case in advance, resulting in a problem that work efficiency is extremely low.

(Means for Solving the Problems) This invention was made to solve the problems of the prior art described above, and will be described in detail below based on embodiments shown in the drawings.

Some monitor television cameras and the like have the following structure in which the focus adjustment mechanism is slid from the lens installation position.

That is, as shown in FIG. 1, a cylindrical body 9 having an inner circumferential thread 7 formed on its inner circumferential surface and an outer circumferential thread 8 formed on its outer circumferential surface, and a threaded portion coupled to this inner circumferential thread 7. 10, and a front plate 13 of a device case such as a monitor television camera, which has a threaded portion 12 coupled to an outer peripheral screw 8. The threaded portion 12 is provided to penetrate the front plate 13.

In this invention, in addition to the focus adjustment mechanism, a lens filter 15 is provided which has a threaded portion 14 that is connected to the inner peripheral screw 7 of the cylindrical body 9 from the side opposite to the side where the lens unit 11 of the cylindrical body 9 is attached. We are prepared. This lens filter 15 is made so that its outer diameter is smaller than the inner diameter of the threaded portion 12 of the front plate 13.

A chassis 16 is attached to the rear of the front plate 13, and an imaging portion 17 is attached to the chassis 16, and the lens unit 11 and the lens filter 15 are attached to the chassis 16.
It is installed coaxially with the

(Function) The lens filter 15 is connected to the side of the cylindrical body 9 opposite to the side to which the lens unit 11 is connected, and the cylindrical body 9 is connected to the threaded portion 12 of the front plate 13. Therefore, the lens filter 15 is normally located inside the equipment case 18.

When the cylindrical body 9 is rotated, the cylindrical body 9, the lens unit 11 and the lens filter 15 coupled thereto move back and forth along the central axis of the threaded portion 12.

When you want to take out the lens filter 15 outside the device case 18, remove the threaded part 12 and the cylindrical body 9.
The cylindrical body 9 is moved forward until the screw connection of the outer circumferential screw 8 is released. Since the outer diameter of the filter 15 is smaller than the inner diameter of the threaded portion 12, the filter 15 can pass through the threaded portion 12. In this way, the filter 15 is taken out of the device case 18 while remaining integral with the cylindrical body 9.

Next, when the filter 15 is rotated and the screw connection with the cylindrical body 9 is released, the filter 15 is removed from the cylindrical body 9, and the filter 15 can be maintained or replaced.

(Effects of the invention) According to this invention, even if a lens filter is placed inside a device case such as a monitor television camera, the filter can be easily taken out without opening the device case. A remarkable practical effect can be obtained in that maintenance and replacement can be facilitated.

[Brief explanation of the drawing]

FIG. 1 is an assembled sectional view of the main parts of a lens filter mounting mechanism in which this invention is implemented. 7... Inner circumference screw, 8... Outer circumference screw, 9... Cylindrical body, 10, 12, 14... Threaded portion, 11... Lens unit, 13... Front plate, 15... Lens filter.

Claims (1)

[Scope of utility model registration request] A cylindrical body having an inner circumferential thread formed on its inner circumferential surface and an outer circumferential thread formed on its outer circumferential surface, a lens unit having a threaded part coupled to the inner circumferential thread, and a threaded part coupled to the outer circumferential thread. In the mounting structure for attaching a lens unit to the front plate of an equipment case, the lens unit has a threaded portion connected to the inner circumferential thread of the cylindrical body from the side opposite to the side to which the lens unit is attached, A lens filter mounting mechanism comprising a lens filter having an outer diameter smaller than the inner diameter of a threaded portion of a front plate.