JPH0421274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wiring structure including a wiring board incorporating various switches, sensors, and wiring arranged near a reel stand of a VTR.

(Technology from the past) After the various switches and sensors of the VTR are fixed to the mechanical chassis, electrical connections are made by manually soldering and wire-wrapping the wires.

It has also been proposed to spread an insulating sheet on the top surface of a mechanical chassis, form a wiring pattern thereon, and use the wiring pattern to establish electrical continuity (Japanese Patent Application Laid-open No. 46301/1983).

(Problem to be solved) Each sensor and each switch has a fixed relative position to its counterpart, and with conventional methods, it takes time and effort to accurately position and fix each sensor and each switch. . In addition, when manually soldering and wire-wrapping electric wires, the wires had to be shaped so as not to interfere with the movement of the parts, which was time-consuming for VTRs that had many moving parts.

Furthermore, when using a wiring pattern formed on an insulating sheet, it is necessary to attach various electronic components onto the wiring pattern on a mechanical chassis, and the connection between the electronic components and the wiring pattern requires manual soldering. However, there was still the problem of poor work efficiency.

(Means for Solving the Problems) The present invention positions and fixes various switches and sensors on a printed wiring board in advance, and attaches them from the back side of a mechanical chassis.
The purpose is to significantly improve the work efficiency of sensor installation and wiring.

The present invention includes a cassette-in switch 52, the erase prevention switch 53, a supply reel sensor 5, a take-up reel sensor 51, and a connector 54 for electrically connecting the above-mentioned switches 52, 53 and sensors 5, 51 together. It is fixedly arranged on a single printed circuit board 41.

The wiring board 4 configured as described above is fixed to the back surface of the mechanical chassis 1, and each switch 5 is
2, 53, the sensors 5, 51 are exposed to the surface of the mechanical chassis 1.

(Functions and Effects) Various switches 52, 53 and sensors 5, 51 can be attached to the printed circuit board in advance before the printed circuit board is attached to the mechanical chassis, and the terminals of the switches and sensors and the conductive pattern can be soldered to the flat printed circuit board. It can be fixed by soldering with a dip, which greatly improves work efficiency compared to conventional manual soldering.

Also, when fixing the printed circuit board 41 to the mechanical chassis 1, the exit holes 11, 12, 1 of the mechanical chassis 1 are
Since the switches and sensors on the printed circuit board are exposed from 3 and 14, the positional relationship between the various components on the mechanical chassis 1 and the switches and sensors will not be disturbed.

Furthermore, since the printed circuit board 41 is attached from the back side of the mechanical chassis 1, the printed circuit board 41 can be exposed regardless of the presence of various structural parts on the mechanical chassis 1, which is convenient for maintenance. Furthermore, the printed circuit board 41 can be removed from the mechanical chassis 1 and the circuit board 41 can be easily replaced.

(Embodiment) FIG. 1 shows a part of a mechanical chassis 1 of a VTR and a wiring board 4 attached to the back surface of the mechanical chassis 1.

The mechanical chassis 1 is equipped with a reel motor 2, a supply reel 3 on both sides of the motor 2, and a take-up reel 31 rotatably fitted to support shafts 32, 32, and a supply reel sensor exit hole corresponding to the supply reel 3. 11. Take-up reel 3
1, a take-up reel sensor exit hole 12 is opened.

Further, a cassette-in switch outlet hole 13 is provided near the supply reel sensor outlet hole 32, and an erroneous erasure prevention switch outlet hole 14 is provided near the take-up reel sensor outlet hole 12.

The wiring board 4 has an arc-shaped notch 42 in which the reel motor 2 is fitted approximately in the center, and the opening holes 11, 12 of the mechanical chassis 1 are formed on the upper surface of the printed circuit board 41, which has a wiring pattern 44 formed on the lower surface. 13,
14, a supply reel sensor 5, a take-up reel sensor 51, a cassette-in switch 52, and an erroneous erasure prevention switch 53 are provided.

The cassette-in switch 52 detects the presence or absence of a cassette, the accidental erasure prevention switch 53 detects the presence or absence of the accidental erasure prevention claw of the cassette, and the supply reel sensor 5 detects the rotation of the Saury reel stand 3. The take-up reel sensor 51 detects the rotation of the take-up reel stand 31, and is a well-known sensor, so the details thereof will be omitted.

Each of the above switches 52, 53, sensors 5, 51
each has a pair of positioning protrusions 6, 6, which are fitted into positioning holes 43 formed in the printed circuit board 41.

The tips of the protrusions 6, 6 expand outward, and when the protrusions 6, 6 are fitted into the positioning holes 43, the enlarged portions 61, 61 serve to prevent them from coming off.

Also, each sensor 5, 51, switch 52, 53
The terminals 50, 50 are connected to the printed circuit board 4 as shown in FIG.
The terminals 50 and wiring pattern 44 are passed through the terminal through-holes 45, 45 of 1 and exposed briefly on the lower surface of the printed circuit board 41, and the board 41 is crushed in a solder dip bath.
and are fixed by soldering 9.

A connector 54 is attached to one end of the printed circuit board 41, and the connector 54 is connected to the conductive pattern 4.
4 through sensors 5, 51 and switch 52,
53.

In the embodiment, five sockets 7, 71, 72, 73, and 74 are further mounted on the printed circuit board 41 in a manner similar to the method for fixing the switches and sensors, and each socket 7 to 74 is attached to the conductive pattern 44 of the printed circuit board 41. It is connected to the connector 54 via.

A loading end switch 8, a forward sensor 81, an unloading switch 82, a loading motor 83, and a rewind sensor 84 fixed on the mechanical chassis 1 are connected to each of the sockets 7-74.

The printed circuit board 41 has through holes 46, 46 into which the bosses 33, 33 of both reel support shafts 32, 32 of the mechanical chassis 1 are fitted, and screw holes 47 for attachment to the mechanical chassis 1.

Checker lands 44a for continuity testing are formed at appropriate locations on the conductive pattern 44 of the printed circuit board 41.

The wiring board 4 is removably fixed to the back surface of the mechanical chassis 1 with screws, and the sensors 5, 51 and switches 52, 53 on the board 4 are connected to the exit holes 11, 12, 13, 14 of the mechanical chassis 1. from the surface of the mechanical chassis 1.

A mating connector (not shown) is fitted into the connector 54, and each sensor 5, 51..., switch 52, 5 is connected.
3. Connect electrically all together.

In Fig. 2, numeral 21 is a capstan motor;
Reference numeral 22 is a cylinder motor.

In carrying out the present invention, a cassette-in switch 52, an erroneous erasure prevention switch 53, a supply reel sensor 5, and a take-up reel sensor 51 are provided.
Of course, it is also possible to incorporate other switches and sensors on the printed circuit board 41.

As described above, in the present invention, the relative positional relationship of each sensor, mechanical chassis, and reel can be accurately obtained,
Extremely easy to work with.

Furthermore, since the electrical connection of each sensor is made by the conductive pattern on the printed circuit board, there are excellent effects such as no need for attaching lead wires or shaping the lead wires.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the mechanical chassis and the wiring board, FIG. 2 is a perspective view of the back side of the mechanical chassis with the wiring board attached, and FIG. 3 is an explanatory diagram of how to fix the sensors and switches. 1... Mechashashi, 11, 12, 13, 14
...Exit hole, 4...Wiring board, 41...Printed circuit board, 5...Supply reel sensor, 51...
Take-up reel sensor, 52...cassette-in switch, 53...accidental erasure prevention switch.

Claims (1)

[Claims] 1 Attach the switches 52, 53, the sensors 5, 51, and the connector 54 for electrically connecting them together to a single printed circuit board 41, and connect the terminals 5 of the switches 52, 53 and the sensors 5, 51.
0 is soldered and fixed to the conductive pattern 44 of a printed circuit board 41 with a solder dip, and the printed circuit board 41 is removably attached to the back surface of the mechanical chassis 1 of the VTR, and the exit hole 1 opened in the mechanical chassis 1 is attached.
1, 12, 13, 14 to each switch 52, 53
and a VTR wiring structure in which the sensors 5 and 51 are exposed on the surface of the mechanical chassis 1.