JPH0318998Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an improvement in a light pen that engages with a screen of a cathode ray tube (CRT) or the like and optically reads positional information on the screen.

(b) Prior Art Figure 4 shows an exploded view of the main parts of a conventional light pen. Optical information P from the CRT screen is guided by a lens Q through an aperture optical fiber R to a light receiving element S, and the light receiving element performs photoelectric conversion and transmits the signal to the outside of the light pen device.
In this case, the optical fiber R end face (R ₁ ,
If scratches such as cutting marks remain on _R2 ), the optical information sensitivity will decrease and it will be difficult to obtain accurate data input. Therefore, it is necessary to polish each of the end surfaces R ₁ and R ₂ to remove the scratches, etc., but introducing this step increases the cost of the device and is inconvenient.
Also, if dust or the like adheres to the lens Q, the sensitivity will decrease, so it is necessary to keep the lens surface clean.Although it is not shown in the conventional device, the pen tip part that protects this lens is disassembled. The drawback was that the work was cumbersome.
For more details on this conventional device, please contact Sanyo Electric Co., Ltd.
You can refer to the light pen attached to the personal computer "MPC-10" manufactured by Co., Ltd., or its service technical data (published in March 1981).

(c) Purpose of the invention The present invention takes into consideration the above-mentioned shortcomings, and aims to provide a new and useful light pen that transmits introduced optical information to a light receiving element without intervening an optical fiber. It is.

(d) Structure of the invention The invention consists of a light pen body equipped with a light-receiving element with a lens attached to the front surface, a holder part for protecting the light pen body, and a light-receiving element detachably attached to the light pen body. This light pen includes a front bushing surrounding an element, and a front cap that is detachably attached to the front bushing and has an opening for introducing optical information into the light receiving element.

Further, this light pen is provided with a transparent plate which is held between the front cap and the front bush and which closes the opening to prevent dust and the like from adhering to the lens on the front of the light receiving element. Note that the surface of this transparent plate can be cleaned through the opening. Furthermore, the front cap has a plurality of small protrusions arranged in a circle in the circumferential direction on the surface facing the CRT screen, so that the front cap can be smoothly engaged with the screen.

(E) Embodiment Figure 1 is a schematic configuration diagram of one embodiment of the present invention, and Figure 2 is a schematic diagram of an embodiment of the present invention.
This figure and FIG. 3 are a central sectional view and an exploded perspective view of the main part of the same embodiment. A light pen (WP) has a tip part A that comes into contact with the CRT screen, a holder part B that supports the tip part so that it can move in and out of the axis, and is held by the fingers, and a light pen that is based on input optical information. It includes a wire section C for transmitting electrical signals and a connector section D for connecting the electrical signals to equipment such as a microcomputer.

The light pen body 2 is configured so that it can be inserted from the front into the outer case 1 constituting the holder part B, and the light pen body 2 is inserted into the outer case 1 that constitutes the holder part B.
The rear part of the cap is screwed to the rear cap E. Although not shown, the light pen main body 2 is divided into two parts, and the two divided parts are connected to each other so that they can expand and contract in the axial direction with an elastic body in between. The front portion of the housing is configured to protrude from the outer case 1. Second
As shown in the figure, the light pen main body 2 includes a wiring board 3, a light receiving element 5 to which leads 4 are connected to the wiring board, and a cylindrical shield part 6 having a threaded part 6a inside the opening. A lens 7 is fixedly provided in front of the light receiving element 5. Although not shown, the wiring board 3 is fixed to the shield part 6, the position of the light receiving element 5 with respect to the shield part 6 is determined in advance, and the light receiving element 5 protrudes from the outer case 1 when stored. It is set as follows.

This light pen body 2 has a front button 8.
A front cap 9 is attached with the front cap 9 interposed therebetween, and is configured to be able to move forward and backward relative to the outer case 1 by a stroke ST by the action of the elastic body.

The front bush 8 has a threaded part 8a that is screwed into the shield part 6, a guide part 8b that slides on the inner wall surface 1a of the outer case 1, a mounting thread part 8c that allows the front cap 9 to be attached and removed, and a front cap 9. It includes a circumscribed conical outer surface portion 8d, a recess 8e for receiving the light receiving element 5, a through hole 8f, and an annular front portion 8g.

The front cap 9 has a threaded portion 9 that is removably screwed into the threaded portion 8c of the front bushing 8.
a, an opening 9b for introducing optical information, and a back surface 9c that abuts against the flange 8h of the front bushing 8.
, a conical side surface 9d surrounding the front bush 8, and a front surface 9e facing the CRT screen. A plurality of small protrusions 10 (three in the embodiment) are arranged in a circle on the front part 9e. When the front bush 8 and front cap 9 are attached to the light pen body 2, the centers of the light receiving element 5, the through hole 8f, and the opening 9b are aligned. Reference numeral 11 denotes a transparent plate, which is held between the front cap 9 and the front bush 8 to prevent dirt and the like from entering the through hole 8f through the opening 9b.

When you hold the holder B of this light pen and press the front cap 9, which corresponds to the pen tip, against the CRT screen, the front cap 9 moves back by the stroke ST, and a built-in switch (not shown) moves according to the back movement. Flip to ON to display information indicating that the light pen device is in use at the connector part D.
to communicate. Light information from the CRT screen is transmitted through the aperture 9b, the transparent plate 11, the through hole 8f, and the lens 7.
It is applied to the light receiving element 5 via the wire section C, where it is converted into an electrical signal and sent to the connector section D through the wire section C.
is transmitted to. When the pressure on the CRT screen is released, the front cap 9 returns to the position shown in Fig. 2 using its built-in elastic body, and at the same time the above switch is turned on.
Flip to OFF.

(F) Effects of the invention This invention places a light-receiving element with a lens attached to the front surface close to the opening of the front cap through which optical information is introduced, and an optical element for transmitting optical information is placed between the two. Since the structure is such that there is no need to deploy fibers, the above-mentioned drawbacks of the conventional device can be overcome. In addition, a transparent plate that protects the light-receiving element with a lens from dust and the like is sandwiched between the front cap and the front bushing, making it easy to assemble the transparent plate, and also to protect the front cap from dirt. Since it is provided facing the opening, the surface of the transparent plate can be cleaned through the opening without disassembling the pen tip, and maintenance is easy.

Furthermore, the tip of the front cap is equipped with multiple small protrusions, so that the front cap itself can be directly
Since the structure does not allow contact with the CRT screen, dust from the charged CRT screen is less likely to adhere to the front cap. Also,
When sliding on a CRT screen to draw, there is less friction, which improves operability.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 and FIG. 3 are a central sectional view and an exploded perspective view of the main parts of the same embodiment, and FIG. 4 is a schematic configuration diagram of the conventional device. Explanation of main symbols, 5...Light receiving element, 2...Light pen body, B...Holder part, 8...Front bush, 9...Front cap, 11...Transparent plate, 10...Small protrusion.

Claims (1)

[Scope of utility model registration request] a light pen body including a light receiving element with a lens attached to the front surface; a holder portion for protecting the light pen body; a front bushing configured to be detachably attached to the light pen body and surrounding the light receiving element; a front cap configured to be detachably attached to the front bushing and having an opening for introducing optical information to the light receiving element; a transparent plate sandwiched between the front bushing and the opening of the front cap; A light pen with multiple small protrusions arranged at the tip.