JPS6318923Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in the input amplifier unit mechanism of electrical measuring instruments, such as multi-pen type recorders.

When classifying various electrical measuring instruments based on their form, they are broadly divided into free-standing types, table-top types, etc., but the demands of the times are to make them smaller, thinner, and lighter, regardless of their form. Therefore, electrical input/output conversion circuits for electrical signal amplification, calculation, control, etc. built into the casings of these devices have also been made into printed circuit boards and units in accordance with the above requirements. When such a circuit unit (input/output conversion unit) is inserted into a device casing, it has two circuit points that should be connected to other mechanisms within the device and a circuit point that should be drawn out as input/output terminals for the device itself. Of course it includes. Therefore, this type of terminal arrangement structure for a circuit unit has two methods: a method in which input/output terminals such as terminals and connectors connected to all necessary circuit extraction points are installed on the front or rear surface of the unit; There is a method in which the conductor array is used directly as the input/output terminals of the circuit unit, and the terminals and connectors that serve as the input/output terminals of the equipment themselves are installed not in the unit but in another part, typically the equipment casing.

However, in the first method, all input and output terminals are arranged on the outside of the unit (or concentrated on the rear of the unit if it is not desirable to expose them on the front of the casing for aesthetic or other reasons).
Interference between input and output signals due to wiring close to each other and interference between signals and power lines are problems, and in the second method, electrical connections must be made to the terminals on the casing body after the unit is inserted into the casing. In addition, there is the same problem of interference between electrical signals as described above due to this long electrical connection.

In order to eliminate the above-mentioned drawbacks of the input/output conversion circuit unit in conventional electrical measuring equipment, the present invention is an input/output converting unit mechanism that is inserted into the casing of the electrical measuring equipment at a suitable location. A unit chassis is provided with operating sections for various switches and variable elements on the back side, and an input/output terminal section for the measuring equipment including terminals or connectors is provided on the rear side, and a front unit chassis is arranged on the bottom side of the unit chassis. and a wiring printed circuit board whose lead terminal portion is close to the rear surface of the unit chassis, and a step between the input/output terminal portion of the unit chassis and the lead terminal portion of the printed circuit board. It is an object of the present invention to provide an input/output conversion unit mechanism for an electrical measuring instrument, which is characterized in that it is provided with a.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway view of the top and side surfaces of an input/output conversion unit for an electrical measuring instrument such as a multi-pen recorder, as viewed obliquely from above. The chassis 1 of this unit has an operation panel 5 having knobs 2, 3, 4, etc. inserted on the front end surface, and an input/output terminal section 8 having a terminal 6 and a connector element 7 on the rear end surface.
was formed. The bottom side of this input/output terminal section 8 is at a higher level than the bottom side of the operation panel 5 at the front end, and the side edges 9 and 10 of the chassis that connect these side ends are arranged in a stepwise manner on the lower side of the rear end. It has a cutout and a continuous bottom side at the same level as the bottom side of the input/output terminal section 8, and these bottom sides are connected to the rear bottom surface 1.
It is connected to 1. A printed circuit board 12 for wiring is fixed as the bottom surface of the chassis near the bottom of the main portion of the chassis side edges 9, 10, excluding the rear end stepped portions. This printed circuit board 12 is appropriately separated from the high-level rear bottom surface 11 mentioned above, and although not shown, circuit elements such as IC chips, resistors, capacitors, transformers, etc. are arranged on the upper surface, and printed wiring is installed. shall be applied.

FIG. 2 is a view of the unit chassis 1 from below. As is clear from this figure, the printed circuit board 12 is separated from the rear bottom surface 11 of the chassis.
On the lower side surface (printed surface) of the rear end, a lead terminal portion 13 consisting of a group of terminal conductors spaced apart from each other on the order of several mm for this printed circuit board circuit is formed.

Figure 3 shows the rear bottom surface 11 of the unit chassis 1.
This shows the difference in level between the rear end portion of the printed circuit board 12, and it will be understood that an electrostatic shielding plate (not shown), for example, can be easily inserted between this difference in level.

When the electrical input/output conversion unit of the present invention configured as described above is inserted into the casing (not shown) of a predetermined electrical measuring device, such as a multi-pen recorder, the unit can be operated according to the pre-designed arrangement relationship between the two. The panel 5 is exposed on the front side of the casing, the input/output terminal section 8 is exposed on the back side of the casing, and the lead terminal section 13 of the printed circuit board 12 is connected to a connector previously arranged inside the casing.

As described above, the present invention separates both terminal portions 11 and 13 by a step, which prevents interference between wires.
The present invention provides an input/output conversion unit mechanism for electrical measuring equipment that facilitates connection of input/output lines.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the top and side surfaces of the circuit unit of the present invention, FIG. 2 is a perspective view of the same as seen from the back, and FIG. 3 is a rear side view. 1... Unit chassis, 2, 3, 4... Knob, 5... Operation panel, 6... Terminal, 7
... Connector, 8 ... Input terminal section, 12 ... Printed circuit board, 13 ... Lead terminal section.

Claims (1)

[Scope of Utility Model Registration Claim] An input/output conversion unit mechanism to be inserted into a proper position in the casing of an electrical measuring device, with operating sections for various switches and variable elements on the front, and terminals or connectors on the rear. A unit chassis is provided with an input/output terminal section for the measuring equipment, including a unit chassis, and the unit chassis is arranged on the bottom surface of the unit chassis so that its own lead terminal section is close to the rear surface of the unit chassis. 1. An input/output conversion unit mechanism for an electrical measuring instrument, comprising: a printed circuit board for wiring, wherein a step is provided between an input/output terminal section of the unit chassis and a lead terminal section of the printed circuit board.