JPS60220668A - Monitoring tv camera - Google Patents

Abstract

PURPOSE:To reduce the size and to simplify the structure of a monitoring TV camera, by performing the back focus of the camera by directly moving a deflecting coil by means of an adjusting ring in the vicinity of a lens seat. CONSTITUTION:A deflecting coil 1 is inserted into the hole 37 of a coil chassis 3 with a wave washer 4 in between and held by a lens seat 6 fixed to the coil chassis 3 under a condition where the coil 1 can move freely in the axial direction. An adjusting ring 5 is screwed on the screw section 2 of the deflecting coil 1 before inserting the coil 1 into the hole 37. If an upper and lower cases 8 and 9 are fixed to the coil chassis 3 thereafter, parts of the ring 5 are projected from the windows 10 of the cases 8 and 9. In this case, the ring 5 is put between the inner surface 61 of the lens seat 6 and front surface 35 of the coil chassis 3 and only rotation is allowed to the ring 5. When the ring 5 is rotated, the coil 1 moves in the axial direction and back focusing is executed.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a surveillance television camera.

Conventional configuration and its problems Conventionally, in this type of camera, the deflection coil system including the image pickup tube is movable in the axial direction with respect to the chassis or case, and its adjustment (back focus) is performed from the rear or front of the camera. It is now possible to do it.

However, the configuration is complicated, which poses an obstacle to miniaturization, cost reduction, and assembly of cameras.

OBJECTS OF THE INVENTION The present invention eliminates these conventional drawbacks and aims to facilitate bank focusing.

Structure of the Invention The present invention provides a threaded portion on a part of the deflection coil, and an adjustment ring corresponding to the threaded part, and a part of the ring protrudes from a part of a case that handles an electric circuit system including the deflection coil. It is equipped with a window that allows the ring to rotate.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. Reference numeral 1 denotes a deflection coil, and a threaded portion 2 is provided partially on the outer peripheral side of the tip. 3 is a coil chassis, which has a U-shaped cross section, and has screw holes 32, stopper holes 33, and screw holes 34 for fixing the case on the upper and lower sides 31 for mounting screws on a tripod, mounting angle, etc. It is set up. 4 is a wave washer, 541 is a jDI ring, and 6 is a lens seat which is fixed to the coil chassis 3 by fitting the screw 7 into the hole 36 of the coil chassis 3. 8 and 9 are above respectively.

Window 1 which is the lower case and partially projects the adjustment ring 6
o is provided.

In the above configuration, the deflection coil 1 is connected to the wave washer 4
is inserted into the fitting hole 37 of the coil chassis 3 through the lens seat 6, which is further fixed to the coil chassis 3 so as to be movable in the axial direction. At this time, the deflection coil 1
The adjustment ring 6 is attached to the threaded part 2 of the coil chassis 3. Fig. 4 shows this state. Next, when the upper case 8 and the lower case 9 are fixed to the coil chassis 3, one part of the adjustment ring 5 is attached. The portion protrudes from the windows 10 of the cases 8 and 9 as shown in FIGS. 1 and 3. In this case, the adjustment ring 5 is inserted between the inner surface 61 of the lens seat 6 and the front surface 350 of the coil chassis 3, so that only rotation is allowed, and when the adjustment ring 6 is rotated, the ring 5 and the deflection coil The deflection coil 1 moves in the axial direction due to its relationship with the threaded portion 2 of the deflection coil 1. Therefore, back focusing can be performed by this.

In addition, in the case of a surveillance camera, it is used while being fixed in one of the positions, and is not something that is constantly touched, like a commercially available TV left camera, and does not require a locking mechanism for the adjustment ring 5. If the lens is selected depending on the place of use, it is essential to adjust the back focus according to the lens.It goes without saying that this adjustment is easy, and it is the same as when the lens is mounted on the lens seat 6. This can be done.

Effects of the Invention As explained above with reference to the embodiments, according to the present invention, back focus can be achieved by directly moving the deflection coil using an adjustment ring at a position close to the lens seat, resulting in miniaturization and simplified structure. can contribute to

Further, when attaching the lens to the lens seat, the adjustment is easy because the adjustment ring can be rotated in the same way as in manual focusing of the lens.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of essential parts of a surveillance camera according to an embodiment of the present invention, Fig. 2 is an exploded perspective view showing the components of the camera, Fig. 3 is a perspective view of the camera, and Fig. 4 is a coil. 01 which is a perspective view of the unit... Deflection coil, 2...
... Adjustment ring, 3 ... Coil chassis, 5
...Adjustment ring, 6...Lens seat, 8
...Top case, 9...Bottom case. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 8 Figure 4 1

Claims (1)

[Claims] A threaded portion is provided on a part of the deflection coil, and an adjustment ring for adjusting the back focus of the deflection coil is provided on the outer periphery thereof, and a part of the adjustment ring protrudes from a case that receives the deflection coil, and the adjustment ring A surveillance television camera equipped with a window that allows rotation of the camera.