JPS6054147A - Bias light device for image pickup tube - Google Patents

Abstract

PURPOSE:To reduce the number of members and the number of processes for the assembly of a bias light device for an image pickup tube by directly fixing a plural number of light sources to the lower lid and electrically connecting the light sources by means of a conductive paste. CONSTITUTION:The case consists of an upper lid having a rectangular opening 14 and a lower lid having a rectangular opening 15. The lower lid 11 is provided with concaves 17 for positioning LEDs 18. After the lead terminals of the LEDs 18 are cut to a proper length, the LEDs 18 are directly fixed to the concaves 17 of the lower lid 11 by means of an adhesive. Next, lead wires 13 extending from an external power source are fixed to the pins 16 of the lower lid 11 by being wound around them several times so as to bring the lead wires 13 into contact with the lead terminals of the LEDs 18. Next, a given amount of a conductive paste is applied to the lead terminal areas of the LEDs 18 as well as to areas formed between the LEDs 18 and the lead wires 13, then dried. After that, a parallel flat plate 12 is fitted in the opening 15 before the upper lid 10 is attached to the lower lid 11, thereby completing the assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bias light device for an image pickup tube that can be used in a television camera.

Conventional configurations and their problems In general, photoconductive image pickup tubes used in television cameras have an afterimage phenomenon that often degrades television image quality. This afterimage phenomenon can be greatly improved by applying weak and constant bias light to the image pickup tube target surface.

A light emitting diode (hereinafter referred to as L) is used as a light source for bias light.
(referred to as ED), using multiple light emitting elements such as incandescent light bulbs, the front (lit (the side where light from the subject is imaged) or the back (the side where the electron beam is irradiated) of the image pickup tube target surface is used.
Conventionally, a method of irradiating the body with light has been used.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A conventional image pickup tube ear slide device and a method of manufacturing the same will be described below with reference to the drawings. FIG. 1 is a perspective view showing the structure of a conventional image pickup tube bias light device manufacturing method, in which 1 is an upper cover of the case, 2 is a lower cover of the case, 3ID parallel plane plate, 4 is a printed circuit board, 5 is an LED, 6 is an IJ-do wire, 7 is an opening in the upper lid, 8 is an opening in the lower lid, and 9 is a convex portion.

A method of manufacturing the image pickup tube ear slide device configured as described above will be described below.

LEDs are generally used as light sources in bias light devices for image pickup tubes because they generate less heat, consume less power, and are smaller. These LEDs 6 are soldered to the printed circuit board 4 at appropriate intervals and arranged in a line.
Ru. Next, two sets of printed circuit boards 4 are fixedly arranged on positioning projections 9 provided on the case lower lid 2. Furthermore, lead wiring to an external power source is also done by soldering. Thereafter, the soldering flux is removed by washing and drying, the parallel flat plate 3 is assembled, and the case top cover 1 is attached to complete the assembly.

However, in the conventional example as described above, soldering is mainly a work, and cleaning and drying steps are required, resulting in a significant increase in cost.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an inexpensive and highly reliable bias jitter device for an image pickup tube that incorporates an adhesive method and reduces the number of assembly steps.

Structure of the Invention The bias light device for an image pickup tube of the present invention includes a parallel plane plate whose main cross section is a mirror surface and whose side surface functions as a light diffusion surface, a plurality of light sources, and an upper cover and a lower cover each having an opening. The parallel plane plate is housed and fixed in the upper case so that the opening thereof is closed in its main cross section, and at least one of the upper cover and the lower cover is provided with an uneven part. The light source is fixedly placed on the uneven surface with adhesive, and the lead wires connecting to the electrodes of the light source and the external electrodes are fixedly wired with conductive paste.This reduces assembly man-hours and parts, and is inexpensive and expensive. It provides reliability.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is an exploded perspective view showing an embodiment of the bias light device for an image pickup tube according to the present invention. In Fig. 2, 10 is the upper lid of the case, 11 is the lower lid of the case, 12 is a parallel plane plate,
13 is the lead wire from the external power supply, 14 is the opening in the top cover,
15 is an opening of the lower lid, 16 is a bottle, 17 is a recess, and 18 is an LED.

A method of manufacturing the bias light device for an image pickup tube according to an embodiment of the present invention configured as described above will be described below.

The case of this bias light device has a rectangular opening 14.
15, J:M, and a lower lid, and the inner wall of each lid is painted white to prevent light absorption and reflect light. Although the lower M11 is provided with a recess 17 for positioning the LEDs, there is no substantial problem even if the LEDs are positioned using the projections. For the LED 18, cut the lead terminal to an appropriate length and fix it directly to the four parts of the lower cover 11 with adhesive. Ru. Adhesive VC←1-Acrylate-based instant adhesive can be used, and 11.
7. There is less loss between the external power source and
Wrap the lead wire 13 around the bottle 16 of the case lower lid 11 several times and fix it, and contact it with the lead terminal of the LED 18. After that, the parallel plane plate 12 is assembled and the case top cover 10 is attached to complete the installation.

As mentioned above, this implementation f! According to t, the light source LE
Since the D18 is directly fixed to the recess 17 of the lower lid 11 of the case with an adhesive, the conventional printed circuit board 4 is not required. Furthermore, since the wiring is fixed using conductive paste, the soldering work is replaced by the work of applying conductive paste, which requires no skill, reduces the number of work hours, and realizes a fluxless process.

Note that a quartz optical reduction humerta may be used as the parallel plane plate. In this case, the original function of a single frequency separation type QJ tube Cassie camera to prevent moiré phenomena can also be used as a bias light device.
The light source is not limited to an LED, as long as it can be bonded, and the components of the conductive paste are not limited as long as it has practical conductivity.

Effects of the Invention As is clear from the above explanation, the present invention has the advantage of reducing the number of parts and assembly man-hours, and achieving a flux-less structure by directly arranging a plurality of light sources with adhesive and fixedly wiring them with conductive paste. An excellent effect of realizing the process can be obtained, and a bias light device for an image pickup tube that is cheaper and more reliable can be obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a main part of a conventional bias light device for an image pickup tube, and FIG. 2 is an exploded perspective view of a main part of a bias light device for an image pickup tube according to an embodiment of the present invention. 10・°°・・°Case top lid, 11-゛-Case bottom lid,
12...Parallel plane plate, 13...Lead wire from external power supply, 14...Opening of upper lid, 1
6... lower lid opening, 16... bottle, 1
7...Concavity, 18...I, KD. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A case comprising a parallel plane plate whose main cross section is a mirror surface and whose side surface functions as a light diffusion surface, and an upper cover and a lower cover each having a plurality of light sources and openings, and inside the case,
The parallel plane plate is accommodated and fixed so that the opening is closed in its main cross section, and at least one of the upper cover and the lower cover is provided with a concave and convex portion for connecting lead wires to the electrodes of the plurality of light sources and the external power source. A bias light device for an image pickup tube characterized by fixed wiring using conductive paste.