JPH08249872A - Substrate connecting structure of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE: To prevent an increase in the number of constituting parts of a connecting structure for mounting a circuit board and mechanism and to lessen the impact load acting on a connector when this connector is arranged in the heavy parts in the mechanism. CONSTITUTION: A chassis 1 of the mechanism is provided with three pieces of bosses 4, etc., to be mounted with the circuit board by outsert molding. The bosses 4, etc., are arranged near a capstan motor 3 mounted with the connector 91. Two pieces among three pieces of the bosses 4, 40, etc., are the same in the height from the surface of the chassis 1. The connector 91 and the connector 81 of the circuit board are fitted in the state that the circuit board is mounted to the bosses 4, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate connecting structure for connecting a substrate on which various switches and sensors are mounted to another substrate in a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, in a magnetic recording / reproducing apparatus, especially a VTR, as shown in FIG. 7, a mechanism deck (7) for recording / reproducing by running a magnetic tape and a mechanism deck (7) are energized. The circuit board (8) to be electrically connected is used by using a harness (200) which is a bundle of covered electric wires. However, in the connection structure using the harness (200), when the mechanism deck (7) and the circuit board (8) are attached, it is necessary to shape and bundle the harness (200), so that the assembling workability is poor and the manufacturing is difficult. High cost.

Therefore, instead of connecting the boards using the harness (200), as shown in FIG. 8, a printed board (9) having a conductive pattern formed in a mechanism deck (7).
And a connector (90) on the board (9) and the circuit board (8) respectively.
A so-called Board to Board connection, in which (80) is arranged and both connectors (90) and (80) are fitted to electrically connect the mechanism deck (7) and the circuit board (8), is used as is known. ing. Specifically, the connectors (80) and (90) are attached to the circuit board (8) attached to the cabinet (100) and the printed board (9) of the mechanism deck (7), respectively. When attaching the mechanism deck (7) to the cabinet (100), both connectors (80) and (90) are fitted together. When mated,
As shown in FIG. 11, the tip surfaces of both connectors (80) and (90) are in contact with each other, and the pin (90a) of the connector (90) is fitted into the socket (80a) of the connector (80) to electrically Connected.

However, in the above connection structure, when the mechanism deck (7) is attached to the cabinet (100), or when a shock or vibration is applied from the outside, the connector (80)
Excessive force is concentrated on the (90) and printed circuit board (9),
(80) (90) and the printed circuit board (9) may be damaged. Therefore, as shown in FIG. 9 and FIG.
(1) The brackets (201) (201) made of resin are attached to the sides by screws, and the circuit board (8) is attached by the brackets (201) (201).
Those who have supported are also proposed. Each bracket (201)
Is provided with a protrusion (201a) that fits on the circuit board (8),
The horizontal position of the circuit board (8) is determined by fitting the projection (201a) and the receiving hole (8b) formed in the circuit board (8).

[0005]

In the connection structure shown in FIGS. 9 and 10, in order to fix the circuit board (8) and the mechanism deck (7), a bracket (20) is attached to the mechanism deck (7).
1) Since (201) is provided, the number of components of the mechanism deck (7) is increased. In addition, such a magnetic recording / reproducing apparatus includes
Various height sizes are required, and it is necessary to change the distance between the mechanism deck (7) and the circuit board (8) according to the model. At this time, depending on the height size of the device,
If you change the type of mechanism deck (7), you have to select the mechanism deck (7) according to the height size,
It takes time and effort to connect the mechanism deck (7) and the circuit board (8). Further, in the connection structure shown in FIGS. 9 and 10, the bracket (201) is attached near the reel stand (5). However, depending on the type of recording / playback device,
Place the connector on the heavy parts such as the capstan motor (3) in the mechanism deck (7), and attach the connector to the circuit board (8).
May have to be electrically connected to. At this time, in the conventional configuration in which the bracket (201) is not arranged near the capstan motor (3), a large load is applied to the connector in a fitted state. Therefore, the connector may be damaged when vibration or impact is applied from the outside of the device. The present invention, in a connection structure for attaching a circuit board and a mechanism, can reduce the impact load applied to the connector when the connector is attached to a heavy component in the mechanism without increasing the number of constituent parts. The purpose is to provide a device. It is also an object to propose a structure in which the circuit board (8) is attached to the one mechanism deck (7) while changing its height.

[0006]

[Means for Solving the Problem] The circuit board (8) is formed on the chassis (1) of the mechanism deck (7) by outsert molding.
At least three bosses (4), (40) and (41) extending toward each other and having different heights from each other, and the highest boss (41) and the lowest boss (40) are respectively located at the tip end and at a high position. Mounting surface (41c)
And mounting surface (40c) for low position, intermediate length boss (4)
Is a two-stage shaft and has a mounting surface (4c) corresponding to the mounting surface (41c) for high position and a mounting surface (4d) corresponding to the mounting surface (40c) for low position. , The mounting surface on which the circuit board (8) is placed is selected, and the circuit board (8) and the boss are fixed. In addition, the boss (4)
(40) (41) are the connectors (91) in the mechanism deck (7).
Is placed near the attached heavy component.

[0007]

[Operation and effect] Since the bosses (4) (40) (41) on the chassis (1) are provided by outsert molding, the number of components does not increase. In addition, the circuit board (8)
When mounting on (1), place the circuit board (8) on the mounting surface (41c)
If it is placed on (4c), the height from the chassis (1) will be high, and if the circuit board (8) is placed on the placement surfaces (40c) (4d), the height from the chassis (1) will be high. Can be set to a low position. Therefore,
By selecting the boss to be attached, the height of the chassis (1) and the circuit board (8) can be changed and attached to one mechanism deck (7). Furthermore, the boss (4)
Since the (41) is arranged in the mechanism deck (7) in the vicinity of the heavy component to which the connector (91) is attached, when a shock or vibration is applied from the outside of the device, the shock or the boss ( 4) The impact received by the connector (41) and applied to the connector (91) can be mitigated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the magnetic recording / reproducing apparatus has a cabinet (100) as an external chassis, a circuit board (8) on which various ICs and electric parts are mounted, and a mechanism for running a magnetic tape, as in the conventional case. Includes a deck (7). For convenience of explanation, the back of the mechanism deck (7) can be seen,
The drawing is shown tilted from the original mounting position, and the description of unnecessary parts is omitted. From the bottom surface of the cabinet (100), the protruding shaft (101) projects upward, and the cabinet (100)
An elastically deformable locking piece (102) is formed on the side surface of the. The distance between the lower surface of the locking piece (102) and the bottom surface of the cabinet (100) is substantially equal to the thickness of the circuit board (8).
The width of (8) is formed substantially equal to the width of the inner surface of the cabinet (100).

For mounting the circuit board (8) and the cabinet (100), the circuit board (8) is lowered, and the hole (85) formed in the circuit board (8) is loosely fitted to the protruding shaft (101). Let When the locking piece (102) is elastically deformed outward at the edge of the circuit board (8) and the circuit board (8) exceeds the locking piece (102), the locking piece (10
2) is elastically restored. Circuit board (8) is cabinet (100)
With the circuit board (8) mounted on the bottom surface of the
The vertical play is regulated by 2). Mechanism deck (7)
From the back side of the, three bosses (4) by outsert molding
(40) (41) protrudes, and the connector (80) on the circuit board (8)
Connectors (90), (91) and (92) are attached to the positions corresponding to (81) and (82). It will be described later which part of the mechanism deck 7 the connectors 90, 91, 92 are attached to. The mechanism deck (7) has the circuit board (8) attached to the bottom surface of the cabinet (100) and the protruding shaft.
(101) It is placed on the upper surface and screwed, and the cabinet (10
0) (see FIG. 3).

At this time, the connector (80) on the circuit board (8)
Corresponding to (81) and (82), the connectors (90), (91) and (92) on the mechanism deck (7) side are fitted. As shown in FIG. 11, the connectors (90), (91), (92) on the mechanism deck (7) side are male connectors having pins (90a) formed inside, and the connectors (80) on the circuit board (8) side. (81) (82) is the socket (90
It is a female connector in which a) is formed, and both have known configurations. The bosses (4), (40) and (41) have the circuit board (8) at the tip.
6 (b), and is fixed to the circuit board (8) by screws (103) penetrating the cabinet (100) from below as shown in FIG. 6 (b). The mounting of the bosses (4) (41) and the circuit board (8) will be described in detail later.

FIG. 2 is a view of the mechanism deck (7) viewed from the front side. The mechanism deck (7) includes a rotating cylinder (2), a capstan motor (3), a reel stand (5), and a tape loading mechanism (not shown) on a chassis (1) made of a rigid plate as is well known. Get The boss (4) (40) (41),
It is erected on the back side of the chassis (1) near the capstan motor (3). Hereinafter, the side on which the rotary cylinder (2) is placed is the front side, and the side on which the reel stand (5) is provided is the rear side. On the back side of the chassis (1) at the cassette mounting position, an arc-shaped control slide (7
0) is provided, and a loading motor (71) for driving the control slide (70) is provided on the concave side of the control slide (70). The loading motor (71) has a gear train (75).
Via the gear train (75) and the cam gear (72) at the time of loading, and the control slide (70) is connected to the cam gear (72) engaged with the end of the control slide (70) on the return direction side. ) Is rotated counterclockwise about the point P.

The cam gear (72) is on the opposite side of the gear train (75),
It meshes with the rotary detection switch (73). Cam gear (7
The detection switch (73) is rotated by the rotation of (2), and the running mode of the magnetic tape (6) to be transferred is determined. A printed circuit board (9) having a conductive pattern is disposed between the control slide (70) and the back surface of the chassis (1), and the printed circuit board (9) has terminals (73a) of the detection switch (73). Are attached by soldering. The loading motor (71)
Is connected to the printed circuit board (9) via electric wires (74) (74). Incidentally, since it is a publicly known technique, although not shown,
The printed circuit board (9) is screwed to the back surface of the chassis (1).

FIG. 4 is a chassis near the reel stand (5) (5).
It is a perspective view which shows (1). Incidentally, for convenience of explanation, description of a leading guide block for pulling out the magnetic tape from the cassette, a brake lever for applying a predetermined rotation load to the reel base (5), and the like are omitted. Between the reel stands (5) and (5) of the chassis (1), there are light emitting element admission holes (10) on both sides of the chassis (1), slightly obliquely forward of the admission holes (10). Light receiving element exit hole (1
1) and 11) are opened respectively. A holding bracket (12) having an open lower surface is formed by outsert molding so as to cover each of the exit holes (10), (11), (11). Right reel stand
A reel stand sensor admission hole (13) is formed below (5), and an erroneous erasure prevention switch admission hole (14) is formed on the side of the left reel stand (5).

At the rear side of the erroneous erasure prevention switch admission hole (14) on the chassis (1), a base end portion of an actuating lever (63) which is spring-biased in a clockwise direction is pivotally supported. Claw piece (64) that contacts the rear end of the cassette, from the center of the operating lever (63) toward the tip.
Is provided, and the projecting piece (65) projects from the central portion. A reel base sensor (50) and an erroneous erasure prevention switch (62) are attached to the upper surface of the printed board (9) at positions corresponding to the respective exit holes (13) and (14).

The erroneous erasure prevention switch (62) is pushed into the projecting piece (65) and emits an ON signal. Specifically, FIG.
As shown in (b), when the claw plate (61) of the cassette (60) closes the detection hole, the claw piece (64) of the actuating lever (63) moves to the claw plate (61) of the cassette (60). Since the contact is made and the actuating lever (63) is rotated counterclockwise against the spring bias, the erroneous erasure prevention switch (62) is turned off. That is, it is detected that the cassette 60 is recordable. As shown in FIG. 5 (a),
When the claw plate (61) of the cassette (60) is removed and the detection hole is opened, the claw piece (64) of the actuating lever (63) moves the cassette (6
0) and the erasure prevention switch (62) is turned on.
That is, it is detected that the cassette (60) cannot be recorded.

As shown in FIG. 4, a light emitting element (51) made up of a photodiode is inserted into the holding bracket (12) which covers the light emitting element exit hole (10), and the light receiving element exit hole (11) is inserted into the holding bracket (12). Light receiving elements (52) (52) formed of phototransistors are inserted into the holding brackets (12) (12) to be covered. Each light emitting element (5
The terminals 1) and the light receiving elements 52, 52 are soldered to the back side of the printed board 9 after being inserted into the holding bracket 12.

As shown in FIG. 2, the connector (90) is
It is mounted on the rear side of the printed circuit board (9) on the side of the transition path of the control slide (70). The connector (90) has 12 pins, and the loading motor (7
1), light emitting element (51), light receiving element (52) (52), detection switch (7
3), erroneous erasure prevention switch (62) and reel base sensor (50) are electrically connected. Although not shown, a printed circuit board
As a component electrically connected to (9), a switch for detecting whether the loaded cassette is the S-VHS type may be provided. The other connectors (92) and (91) are attached to the rotary cylinder (2) and the capstan motor (3), respectively. A power supply voltage and an FG pulse for speed control are input to the connectors (91) (92).

As described above, with the mechanism deck (7) attached to the cabinet (100), the connectors (90), (91) and (92) of the mechanism deck (7) and the connector on the circuit board (8). (80) (81) (82) fit, mechanism deck (7)
Can be energized. At this time, the bosses (4) (41) protruding from the chassis (1) and the circuit board (8) are screwed together,
Even if a shock or vibration is applied from the outside, the distance between the circuit board (8) and the printed board (9) of the mechanism deck (7) does not change, and the connectors are securely fitted together. Boss (4) (40) (4
Since 1) is provided by outsert molding, the number of component parts does not increase compared to the conventional structure where the bracket was attached to the chassis (1) as a separate component, and the chassis
The mounting position accuracy with respect to (1) is also improved. Also the boss
By placing (4), (40) and (41) in the vicinity of the capstan motor (3), which is a relatively heavy component of the mechanism deck (7), shock and vibration are applied from the outside of the device. When this occurs, the impact is received by the bosses (4) (40) (41), and the connector
The shock applied to (91) can be mitigated.

(Mounting of boss and circuit board) Various sizes are required for the magnetic recording / reproducing apparatus. For example, both a regular size having a lateral width of about 42 to 45 mm and a midi size having a lateral width of about 36 mm are required. Need to correspond. The midi size is required to have a height about 2 mm lower than the regular size, and it is necessary to change the distance between the mechanism deck (7) and the circuit board (8) in view of such requirements. The magnetic recording / reproducing apparatus according to the present embodiment has a circuit board for one mechanism deck (7).
It is proposed that the mounting of (8) is performed by changing the height. Details are shown below.

FIG. 6A is a view of FIG. 2 taken along the line AA. For convenience of explanation, the capstan motor (3) is shifted to the right and is shown by a one-dot chain line, and the portion above the chassis (1) is omitted. Also, the boss (40) is shown with a slight offset to the right. The bosses (4) (40) (41) have different heights, with the boss (41) being the highest and the boss (40) being the lowest. Each boss (4) (4
A mounting hole (42) into which a screw can be screwed is formed on the front end surface of the (0) (41), and the bosses (4) and (41) are provided with heights substantially equal to the thickness of the circuit board (8). Lower shaft (4a) (41a) and the lower shaft
The upper shafts (4b) and (41b) having a larger diameter than (4a) and (41a) are integrally provided, and are formed in steps. The tip surfaces of the upper shafts (4b) (41b) form mounting surfaces (4d) (41c) on which the circuit board (8) is mounted. Further, the tip surface of the boss (40) and the tip surface of the lower shaft (4a) also form mounting surfaces (40c) (4c), respectively.

When the space between the mechanism deck (7) and the circuit board (8) is set for the regular size according to the regular size, the circuit board (8) is opened as shown in FIG. 6 (b). The hole (83) and the lower shaft (41a) of the boss (41) are fitted to each other for horizontal positioning, and the circuit board (8) is placed on the mounting surface of the lower shaft (4a) of the boss (4). 4c) and the mounting surface (41c) of the upper shaft (41b) of the boss (41). At this time, the boss (40)
No substrate is placed on. The circuit board (8) is attached to the mechanism deck (7) by screwing the screw (103) into the mounting holes (42) of the bosses (4) and (41), and the circuit board from the rear surface of the chassis (1).
The height up to (8) is set to the dimension A.

Mechanism deck compatible with midi size
When setting a small gap between (7) and the circuit board (8), as shown in FIG. 6 (c), the hole (83) formed in the circuit board (8).
And the lower shaft (4a) of the boss (4) are fitted to each other for horizontal positioning, and the circuit board (8) is placed on the mounting surface (4) of the boss (40).
0c) and the mounting surface (4d) of the upper shaft (4b) of the boss (4). At this time, the circuit board (8) is loosely fitted in the boss (41). The circuit board (8) is attached to the mechanism deck (7) by screwing the screw (103) into the mounting holes (42) of the bosses (4) and (40), and the circuit board (8) is attached from the rear surface of the chassis (1). Up to
The size B is set to be 2 mm lower than the size A. Therefore,
One mechanism deck by selecting the boss to be attached and changing the position and size of the hole (83) of the circuit board (8)
With respect to (7), the chassis (1) and the circuit board (8) can be mounted by changing their heights. In other words, the circuit board
In order to connect (8) and the mechanism deck (7), at least two bosses are required. To change the height position,
You need another boss. Circuit board
Depending on the size of (8), a plurality of sets of bosses (4) (40) (41) may be provided.

In the above embodiment, the mechanism deck
The reason why the bosses (4), (40) and (41) are formed on the chassis (1) of (7) and not provided on the circuit board (8) side is as follows. The circuit board (8) is generally formed of paper phenolic resin or epoxy resin containing glass fiber. However,
The circuit board (8) molded with the resin has large warpage and distortion,
Not suitable for outsert molding. Therefore, the bosses (4), (40) and (41) are erected by the outsert molding on the chassis (1) which is formed of a rigid plate and has a small warpage and distortion.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a cabinet, a circuit board, and a mechanism.

FIG. 2 is a plan view in which a chassis is partially broken.

FIG. 3 is a view showing a fitting state of a connector with a cabinet partially broken.

FIG. 4 is an enlarged perspective view of the vicinity of a reel stand.

FIG. 5 is an explanatory diagram showing the operation of the operating lever.

FIG. 6A is a diagram showing an arrangement relationship of bosses, and FIGS. 6B and 6C are diagrams showing a state in which a circuit board is attached to the bosses.

FIG. 7 is a perspective view showing a conventional board connection structure.

FIG. 8 is a diagram showing a general structure for connecting substrates by fitting connectors together.

FIG. 9 is a perspective view of a mechanism for supporting a substrate using a conventional bracket.

FIG. 10 is a partially cutaway front view of the above.

FIG. 11 is a view showing a fitted state of the connector.

[Explanation of symbols]

 (1) Chassis (4) Boss (7) Mechanism (8) Circuit board (41) Boss (81) Connector (91) Connector

Claims (2)

[Claims] 1. A connector (91) (81) is provided on a lower surface of a mechanism deck (7) having a recording / reproducing mechanism on a chassis (1) and an upper surface of a circuit board (8) so as to face each other, and both connectors are provided. (9
1) (81) is fitted, and mechanism deck (7) and circuit board
In a board connection structure for electrically connecting (8), at least 3 different heights are formed on the chassis (1) of the mechanism deck (7) by outsert molding and extend toward the circuit board (8). Boss (4) (40) (41) of the book is projected,
The highest boss (41) and the lowest boss (40) each have a high-positioning mounting surface (41c) and a low-positioning mounting surface (40c) at the tip end, and have an intermediate length boss (4). ) Is formed on a two-stage shaft and has a mounting surface (4c) corresponding to the mounting surface (41c) for high position and a mounting surface (4d) corresponding to the mounting surface (40c) for low position. Equipment, circuit board
A board connecting structure characterized in that a mounting surface on which (8) is placed is selected and a circuit board (8) and a boss are fixed. 2. The boss (4) (40) (41) is a mechanism deck.
The board connection structure according to claim 1, wherein the board connection structure is arranged in the vicinity of the heavy component to which the connector (91) is attached in the (7).