JP2989510B2 - Substrate connection structure of magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate connection 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 and reproducing by running a magnetic tape and a mechanism deck (7) are energized. A circuit board (8) to be electrically connected using a harness (200), which is a bundle of covered electric wires, is used. However, in the connection structure using the harness (200), when the mechanism deck (7) and the circuit board (8) are attached, the harness (200) needs to be shaped and bundled. High cost.

Therefore, instead of connecting the boards using a 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) is provided on the board (9) and the circuit board (8), respectively.
A so-called “Board to Board” connection, in which a connector (80) is provided and both connectors (90) and (80) are fitted together to electrically connect the mechanism deck (7) and the circuit board (8), is used as is known. ing. Specifically, 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), the two connectors (80) and (90) are fitted. In the mated state,
As shown in FIG. 11, the distal end surfaces of both connectors (80) and (90) are in contact with each other, and the pins (90a) of the connector (90) are fitted into the sockets (80a) of the connector (80) and electrically connected. Connected.

However, in the above connection structure, when the mechanism deck (7) is attached to the cabinet (100) or when shock or vibration is applied from the outside, the connector (80)
(90) and printed circuit board (9) are concentrated on the connector
(80), (90) and the printed circuit board (9) may be damaged. Therefore, as shown in FIG. 9 and FIG.
(1) Attach resin brackets (201) and (201) to the sides with screws and use the brackets (201) and (201) to mount the circuit board (8).
Some have also been suggested. Each bracket (201)
Has a projection (201a) fitted to 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, a bracket (20) is attached to the mechanism deck (7) in order to fix the circuit board (8) and the mechanism deck (7).
1) Since (201) is provided, the number of components of the mechanism deck (7) increases. In addition, such magnetic recording / reproducing devices include:
Various heights 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 must select the mechanism deck (7) according to the height size,
When connecting the mechanism deck (7) and the circuit board (8), it takes time and effort. In the connection structure shown in FIGS. 9 and 10, a bracket (201) is attached near the reel base (5). However, depending on the type of recording / reproducing device,
A connector is placed on a heavy component such as a capstan motor (3) in a mechanism deck (7), and this is mounted on a circuit board (8).
May need to be electrically connected to the At this time, in the conventional configuration in which the bracket (201) is not disposed near the capstan motor (3), a large load is applied to the connector in the fitted state. Therefore, when vibration or impact is applied from the outside of the device, the connector may be damaged. The present invention relates to a recording / reproducing method which can reduce a shock load applied to a connector when a connector is attached to a heavy component in the mechanism without increasing the number of component parts in a connection structure for attaching a circuit board and a mechanism. It is intended to provide a device. It is another object of the present invention to propose a configuration in which a circuit board (8) is attached to one mechanism deck (7) at a different height.

[0006]

A circuit board (8) is formed on a chassis (1) of a mechanism deck (7) by outsert molding.
And at least three bosses (4), (40), and (41) projecting toward each other and having different heights from each other, the highest boss (41) and the lowest boss (40) are each provided at the tip with a high position. Mounting surface (41c)
And middle length boss (4)
Has a mounting surface (4c) corresponding to the mounting surface (41c) for the high position and a mounting surface (4d) corresponding to the mounting surface (40c) for the low position. Then, the mounting surface on which the circuit board (8) is placed is selected, and the circuit board (8) and the boss are fixed. Furthermore, boss (4)
(40) and (41) are connectors (91) in the mechanism deck (7).
Are arranged near the heavy parts to which the parts are attached.

[0007]

[Operation and Effect] Since the bosses (4), (40) and (41) on the chassis (1) are provided by outsert molding, the number of components does not increase. Also, the circuit board (8) is
When mounting on the (1), place the circuit board (8) on the mounting surface (41c).
(4c), the height from the chassis (1) is high, and the circuit board (8) is mounted on the mounting surfaces (40c), (4d). Can be set to a low position. Therefore,
By selecting the boss to be attached, the chassis 1 and the circuit board 8 can be attached to one mechanism deck 7 by changing the height. Furthermore, boss (4)
Since (41) is arranged near the heavy component to which the connector (91) in the mechanism deck (7) is attached, when an impact or vibration is applied from the outside of the device, the impact or the like is applied to the boss ( 4) The shock received at (41) and applied to the connector (91) can be reduced.

[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, a magnetic recording / reproducing apparatus includes 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 related art. It has a deck (7). For convenience of explanation, the mechanism deck (7) has its back visible.
It is shown in an inclined position from the original mounting position, and parts not required for description are omitted. From the bottom surface of the cabinet (100), a projecting shaft (101) projects upward, and the cabinet (100)
An elastically deformable locking piece (102) is formed on the side face of the lock. 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 substantially equal to the width of the inner surface of the cabinet (100).

In mounting the circuit board (8) and the cabinet (100), the circuit board (8) is lowered, and a hole (85) formed in the circuit board (8) is loosely fitted to the protruding shaft (101). Let it. At the edge of the circuit board (8), the locking piece (102) is elastically deformed outward, and when the circuit board (8) exceeds the locking piece (102), the locking piece (10)
2) elastically returns. Circuit board (8) is cabinet (100)
With the circuit board (8) mounted on the bottom of the
The backlash is regulated by 2). Mechanism deck (7)
From the back side, three bosses (4) by outsert molding
(40) (41) protruding and connector (80) on circuit board (8)
Connectors (90), (91), and (92) are attached at positions corresponding to (81) and (82). Which component in the mechanism deck (7) the connector (90) (91) (92) is attached to will be described later. The mechanism deck (7) has a projecting shaft with the circuit board (8) attached to the bottom of the cabinet (100).
(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)
The connectors (90), (91) and (92) on the mechanism deck (7) side are fitted corresponding to (81) and (82). As shown in FIG. 11, the connectors (90), (91) and (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) and (82) are sockets (90
This is a female connector formed with a), both of which have a known configuration. Also, the bosses (4), (40), and (41) have a circuit board (8)
6 and 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) and (41) and the circuit board (8) will be described later in detail.

FIG. 2 is a view of the mechanism deck (7) as viewed from the front side. The mechanism deck (7) includes a rotating cylinder (2), a capstan motor (3), a reel base (5), and a tape loading mechanism (not shown) on a chassis (1) made of a rigid plate, as is well known. I can. The boss (4) (40) (41)
It stands upright near the capstan motor (3) on the back side of the chassis (1). Hereinafter, the side on which the rotating cylinder (2) is mounted is referred to as a front side, and the side on which the reel base (5) is provided is referred to as a rear side. On the rear 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). Loading motor (71), gear train (75)
Through a cam gear (72) engaged with the end of the control slide (70) on the return direction side.When loading, the control slide (70) is connected via the gear train (75) and the cam gear (72). ) Is rotated counterclockwise about the point P.

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

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

A rear end of an operating lever (63) biased in a clockwise direction is pivotally supported at the rear side of the erroneous erasure prevention switch exit hole (14) on the chassis (1). Claw piece (64) that comes into contact with the rear end of the cassette from the center of the operating lever (63) toward the front end
Are provided, and a protruding piece (65) protrudes from the central portion. A reel stand sensor (50) and an erroneous erasure prevention switch (62) are mounted on the upper surface of the printed circuit board (9) at positions corresponding to the projection holes (13) and (14).

The erroneous erasure prevention switch (62) is pushed into the protruding piece (65) to generate 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 operating lever (63) contacts the claw plate (61) of the cassette (60). The contact lever is rotated counterclockwise against the urging of the operating lever (63), so that the erroneous erasure prevention switch (62) is turned off. That is, it is detected that the cassette (60) is recordable. As shown in FIG.
When the claw plate (61) of the cassette (60) is removed and the detection hole is opened, the claw (64) of the operation lever (63) is moved to the cassette (6).
0) and the erroneous erasure prevention switch (62) is turned on.
That is, it is detected that the cassette (60) cannot record.

As shown in FIG. 4, a light emitting element (51) composed of a photodiode is inserted into a holding bracket (12) that covers the light emitting element exit hole (10), and is inserted into the light receiving element exit hole (11). Light receiving elements (52) and (52) each composed of a phototransistor are inserted into the holding brackets (12) and (12) to be covered. Each light emitting element (5
After the 1) and the light receiving elements (52) and (52) are inserted into the holding bracket (12), the terminals are soldered to the back side of the printed circuit board (9).

As shown in FIG. 2, the connector (90)
At the back side of the printed circuit board (9), it is attached to the side of the transition path of the control slide (70). The connector (90) has 12 pins, and a loading motor (7
1), light emitting element (51), light receiving element (52) (52), detection switch (7
3), is electrically connected to the erroneous erasure prevention switch (62) and the reel base sensor (50). Although not shown, printed circuit board
As a component electrically connected to (9), a switch for detecting whether or not the loaded cassette is an 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, an FG pulse for speed control, and the like are input to the connectors (91) and (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 connectors on the circuit board (8) are connected. (80) (81) (82) are fitted and the mechanism deck (7)
Can be energized. At this time, the bosses (4) and (41) projecting from the chassis (1) and the circuit board (8) are screwed.
Even if 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. Boss (4) (40) (4
Since 1) is provided by outsert molding, the number of components does not increase compared to the conventional structure in which a bracket is attached to the chassis (1) as a separate part.
The mounting position accuracy for (1) is also improved. Also the boss
(4) By arranging (40) and (41) near the relatively heavy capstan motor (3) among the components of the mechanism deck (7), shocks and vibrations are applied from outside the device. Bosses (4), (40) and (41)
The shock applied to (91) can be reduced.

(Mounting of Boss and Circuit Board) Various sizes of magnetic recording / reproducing devices are required. For example, both a regular size having a width of about 42 to 45 mm and a midsize having a width of about 36 mm are used. It is necessary to respond to. In the case of the midi size, it is required that the height is lower than the regular size by about 2 mm. In view of such a request, it is necessary to change the distance between the mechanism deck (7) and the circuit board (8). The magnetic recording / reproducing apparatus according to the present embodiment includes a circuit board for one mechanism deck (7).
The present invention proposes a configuration in which the mounting of (8) is performed by changing the height. Details are shown below.

FIG. 6A is a view in which FIG. 2 is cut along the line AA. For convenience of description, the capstan motor (3) is shifted to the right and shown by a dashed line, and the portion above the chassis (1) is omitted. Also, the boss (40) is shown slightly shifted to the right. The bosses (4), (40) and (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 opened at the tip end surface of (0) (41), and the bosses (4) and (41) have heights substantially equal to the thickness of the circuit board (8). Lower shaft (4a) (41a), and the lower shaft
(4a) The upper shafts (4b) and (41b) having a larger diameter than the (41a) are integrally formed to be stepped. The tip surfaces of the upper shafts (4b) and (41b) form mounting surfaces (4d) and (41c) on which the circuit board (8) is mounted. Further, the distal end surface of the boss (40) and the distal end surface of the lower shaft (4a) also form the mounting surfaces (40c) (4c), respectively.

When the distance between the mechanism deck (7) and the circuit board (8) is set for the regular size in accordance with the regular size, as shown in FIG. 6 (b), the space is established on the circuit board (8). The circuit board (8) is placed on the mounting surface (4a) of the lower shaft (4a) of the boss (4) while the horizontal hole (83) and the lower shaft (41a) of the boss (41) are fitted to each other to perform horizontal positioning. 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 substrate. The screw (103) is screwed into the mounting hole (42) of the boss (4) (41), and the circuit board (8) is mounted on the mechanism deck (7).
The height up to (8) is set to the dimension A.

Mechanism deck corresponding to midi size
When setting a small distance between (7) and the circuit board (8), as shown in FIG. 6 (c), the hole (83) opened in the circuit board (8) is used.
The circuit board (8) is mounted on the mounting surface (4) of the boss (40) while fitting the circuit board (8) with the lower shaft (4a) of the boss (4) and positioning the circuit board in the horizontal direction.
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 to the boss (41). The screw (103) is screwed into the mounting hole (42) of the boss (4) (40), and the circuit board (8) is mounted on the mechanism deck (7). The height up to,
The dimension B is set to 2 mm lower than the dimension A. Therefore,
By selecting the boss to be mounted and changing the position and size of the hole (83) of the circuit board (8), one mechanism deck
With respect to (7), the height of the chassis (1) and the circuit board (8) can be changed and attached. In other words, the circuit board
In order to fasten the mechanism deck (7) with (8), at least two bosses are required, and in order to change the height position,
You need another boss. The circuit board
A plurality of bosses (4), (40), and (41) may be provided according to the size of (8).

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 are not provided on the circuit board (8) side is as follows. The circuit board (8) is generally formed of a paper phenol resin or an epoxy resin containing glass fiber. However,
The circuit board (8) molded from the resin has large warpage and distortion,
Not suitable for outsert molding. Therefore, the bosses (4), (40) and (41) are erected by outsert molding on the chassis (1) formed of a rigid plate and having a small warpage or distortion.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the 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 diagram showing a state in which the cabinet is partially broken and a connector is fitted.

FIG. 4 is an enlarged perspective view near a reel base.

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

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

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

FIG. 8 is a diagram showing a general structure in which connectors are fitted to each other to connect substrates.

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

FIG. 10 is a front view in which a part of the above is cut away.

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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G11B 33/12 304 G11B 33/12 302 G11B 15/26

Claims (2)

(57) [Claims] A connector (91) (81) is provided on a chassis (1) at a position facing a lower surface of a mechanism deck (7) having a recording / reproducing mechanism and an upper surface of a circuit board (8). (9
1) By fitting (81), mechanism deck (7) and circuit board
In the board connection structure for electrically connecting (8), at least three extending at different heights from the chassis (1) of the mechanism deck (7) toward the circuit board (8) by outsert molding. The bosses (4), (40) and (41) of the book protrude,
The highest boss (41) and the lowest boss (40) have a mounting surface (41c) for the high position and a mounting surface (40c) for the low position at the tip, respectively, and the boss (4 ) Is formed on a two-stage shaft, and a mounting surface (4c) corresponding to the mounting surface (41c) for the high position and a mounting surface (4d) corresponding to the mounting surface (40c) for the low position. , Circuit board
A board connection structure, wherein a mounting surface on which (8) is mounted is selected, and the circuit board (8) and the boss are fixed. 2. The boss (4) (40) (41) is a mechanism deck.
2. The board connection structure according to claim 1, wherein the board connection structure is disposed in the vicinity of the heavy component to which the connector is attached.