JPS5873038A - Magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To simplify the constitution of a titled device and to attain small-sized device, by detecting in which mode the mode resides from the change in the amount of light received at a photodetector. CONSTITUTION:A cam plate position detecting mechanism 42 consists of a light shielding member 53 provided between a light source 51 and a photodetector 52 opposing to the light source 51, and a mode detection section detecting the mode from the change in the amount of light received at the photodetector 52. Further, the photodetector section 52 consists of a pair of upper and lower photodetectors 52a, 52b arranged in correspondence to each upper and lower section of a bottomed cylinder 55, and the detectors 52a, 52b sence optical signals, generate an electric signal and give inputs to the mode detector. That is, when the detectors 52a, 52b detect no light, the stop mode is obtained and when the detector 52a only detects light, the fast forwarding and rewinding modes are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus, and more particularly to a magnetic recording and reproducing apparatus that employs a cassette called a general audio cassette or a compact cassette in which a magnetic tape is stored in a half.

As is well known, a magnetic recording/reproducing device consists of a supply reel stand, a take-up reel stand, which is connected to and removed from a reel installed in a cassette, and a normal direction for running the magnetic tape at a constant speed in the normal direction or rewinding direction. It is equipped with a capstan shaft, a rewind direction capstan shaft, and a magnetic head, among which the oscillator type is used, for example, in car stereos. In such a magnetic recording/reproducing device, the configuration is simplified while maintaining reliability of operation.
It is desirable to achieve miniaturization of the device.

However, in conventional devices of this type, each reel stand and capstan shaft was driven by a separate drive source, and a plunger was used to switch the movement of the head toward and away from the anaerobic tape. In addition to the 1W structure of the drive system, those that employ a felt-based slip mechanism as a means for generating the rotation direction of the reel stand have the problem of reduced reliability due to felt wear. This hindered the miniaturization and price reduction of equipment. Also, stopping, fast forwarding, rewinding, and
To detect the status of each mode such as cueing, recording and playback,
Since the S-contracted detection mechanism was used, the structure became complicated and was a cause of failure.

This invention has been made in view of the above circumstances, and is configured to transmit the output of the forward/reverse rotation drive mechanism to the supply side reel stand and take-up side reel stand using an idler gear. It is an object of the present invention to provide a magnetic recording/reproducing device which can optically detect the magnetic field, thereby simplifying the overall structure of the device and achieving miniaturization.

Next, additional embodiments of the present invention will be described with reference to FIGS. 1 to 11.

Figures 1 to 4 are partially cutaway plan views for explaining each operating state of the magnetic recording and reproducing device, Figures 5 to 7 are plan views for explaining the same states, and Figure 8 is a middle view. A bottom view of the Yapstan shaft drive system, FIG. 9 is a perspective view of the main parts, FIG. 10 is a developed view of the light shielding member, and FIG. 11 is an explanatory diagram of the operation.

In FIGS. 1 to 7, (1) shows the main body of the magnetic recording and reproducing apparatus, and its substrate (2) includes a take-up side reel stand (8) and a supply side reel stand (4), as in the conventional case. and each capstan shaft in the normal direction and the rewinding direction (5), (6
) are provided facing each other. In the illustrated example,
Take-up side reel stand gear (6&) on take-up side reel stand (8)
However, a supply reel stand gear (4&) is also integrally formed on the supply side reel stand (4) coaxially with the respective rotation axes. And these two gears (3m), (4
m), the output shaft (7) of the forward/reverse rotation drive mechanism is arranged. This forward/reverse rotation drive structure has both the functions of a synchronous motor and an eddy current motor, and is attached to the back surface of the substrate (2). As shown in FIG. 8, a pulley (8) is fixed to the output shaft (7), and the two capstan shafts (6) described above are connected to this pulley (8).

A transmission bell) (b) is hung across the pulleys (9) e a * fixed to the respective capstan shafts (5) e (6
). In addition, as shown in FIGS. 11111 to 7, a pinion (a pinion) is fitted to the output shaft (7) so as to be relatively rotatable, and the pinion is connected to the rotation speed of the output shaft (7). It is now possible to extract almost constant rotational torque without any problems. A rack A is fixed to the base plate (2) so as to be spaced apart from and opposite to the pinion.

As shown in Figures 1 to 4, the slide plate (IO
2 is provided, and an idler gear <17) is rotatably supported on this slide plate (b). A guide mechanism is provided between the slide plate (2) and the substrate (2). JL-wise, this guide mm (to) fits into a pair of left and right arc-shaped guide holes (18 m) formed on the slide plate (1@), and this pair of guide holes (18 m). This guide mechanism (
(e) is useful for swinging the idler gear (b) left and right around the pinion while keeping it meshed with the pinion (i.e., keeping the distance between its centers constant).

In other words, the 115th! As shown in if, the eye luger (b) connects the binion (b) and the rack (to) at the center between the take-up side reel stand gear (6&) and the supply side reel stand gear (4&). However, when the pinion (from this state) is rotated in the positive direction (counterclockwise) as shown by the arrow, the idler gear αη rotates clockwise and rotates in the clockwise direction. Kick the rack (to) and swing it in the direction approaching the take-up side reel stand gear (6&).In this case, turn the swing of the idler gear (b) to this pinion (around 0). The guide mechanism (E) is provided in order to rotate the pinion (2) in the opposite direction (toward the hour hand).
The oscillation of is determined by the position where this eye gear 〇η meshes with the take-up side reel stand gear (6 &) and the position where this eye gear 〇η meshes with the take-up side reel stand gear (6 &) and the supply side reel stand gear (
41) and the meshing position. In that case, it is desirable to obtain the most appropriate meshing condition when the idler gear (17) is located at the left and right swing limit.For this purpose, the stopper mechanism (4) and the plate link are A cam plate ψ0 is provided.

X) The collar mechanism (to) includes a pair of left and right protruding pieces (19a) provided on the slide plate (19a), and a locking member provided on the base plate (2) opposite to these protruding pieces (19m). When the corresponding projecting piece (19m) and the locking piece (19b) come into contact with each other due to the swinging of the idler gear (b) in the forward or reverse direction, When this idler gear 〇η is at its swing limit and in the most appropriate condition, the take-up side reel stand gear (
6&) or the supply side reel stand gear (41). In addition, the plate link () is swingably supported on the base plate (2) by the pin () at its center, and a locking pin (23 m) provided at the tip thereof is formed on the slide plate (o6). Long hole c 23b
) is engaged in an inset manner. Furthermore, on one side of the support by the plate link) and on one side of the support by the bin), there is provided a first cam part of the cam and the rate plate 0) facing the plate link. This first cam portion) has two cam surfaces (25&) and (25b) that face Nobuko from the sides and are symmetrical to each other in the state shown in FIG. Therefore, when the slide plate () swings to the left or right along with the idler gear (17) in response to forward or reverse rotation of the pinion (b), the slide plate (b) is Since the connected plate link ■ swings to the right or left around the bin, the cam plate immediately after this swing starts? 0 is advanced, any cam surface (25
1L) and (25b), and Nobuko (c) continues to swing even after the idler gear αη is separated from the rack.

The moth is also set in a proper meshing state by the stopper mechanism.

Next, a positioning mechanism for the idler gear αη is provided between the plate ring # and the substrate (2).

This positioning cap OI connects the pair of legs of the spring (26a) hooked to the bottle to the plate link (a).
The cut and raised pieces (26b) are faced from both sides, and the substrate (26b) is
) is made to protrude from the pair of legs 1. This positioning mechanism always returns to its original state when the plate link action swings from side to side.
The plate link action is energized in the direction to restore the state shown in the figure. Therefore, the idler gear (17) is also always urged in the direction of returning to the neutral position shown in FIG.

On the other hand, pinch rollers @ and f14 are provided for the pair of capstan shafts (5) and (6), respectively. This pinch roller), ni) is a support shaft protruding from one board (2).
.

- is attached to - via a swing arm 〇〇, -, and a pinch roller (manufactured), -'s 1g1 rolling support shaft -, n is extended to the vicinity of the surface of the substrate (2). One end and the other end of the stopper plate are allowed to move in and out of the swing path around the rotation support shafts - and -.

That is, this stopper plate) is held by a guide mechanism so as to be able to slide left and right on the board (2), and its longitudinal center portion is held by a locking pin (B) provided at the other end of the plate link (2). It is locked. Therefore, the stopper plate slides to the left or right in conjunction with the swing of the plate link to the right or left, and selectively extends one end or the other end thereof into the swing path. Make them retreat.

Next, -1 and (2) indicate braking mechanisms, which are provided corresponding to the take-up side reel stand gear (3&) and the supply side reel matching gear (4&), respectively.

The braking mechanism corresponding to the take-up side reel table gear (3&) consists of a bent part of an inverted-shaped swinging piece (35a) supported by a support shaft (38b) protruding from the base plate (2). , a rubber playing part (58o) as an operating part is provided at one end of this rocking piece (38&), and a Nobuko (384) is provided at the other end, and the playing part (380) is provided at the other end.
) is interposed between this swinging piece (38m) and the base plate (2), which always urges the reel stand gear (6&) in a direction to press it against the take-up side reel stand gear (6&). Supply side reel stand gear (
The braking mechanism corresponding to 4&) is arranged symmetrically with respect to the 1st braking mechanism. In other words, (39m) is the rocking piece,
(39k) is the support shaft, (39o) is the brake shoe, (
394) is Nobuko, and (39・) is Spring.

− means to stop, record/playback, fast forward, rewind, and
This is a mode switching mechanism for switching between various mode states such as cueing. This mode switching mechanism consists of the above-mentioned cam plate (2), a cam plate drive mechanism (b) for moving the cam plate) ψ0 in and out, a cam plate position detection mechanism, and a cam plate that manually moves the cam plate into and out. In one illustrated example, the manual mechanism for retracting the
The main dial will be displayed as follows.

The cam plate ψ9 is disposed above the plate link as one, and is held by a guide mechanism so as to be slidable left and right on the base plate (2). And - this force^ In addition to the first cam part (c) mentioned above, Nobuko (35a) of the braking mechanism -1f4,
Two second cam parts (45m) corresponding to (39a), (
45b). These second cam parts (45m), (
4513) has three valleys j, m, n and three peaks X-F
e II alternately, with valleys 1.臘.

When Nobuko (3Ba) and (39a) follow the above-mentioned Nobuko (3Ba) and (39a), the brake shoes (, 5go) and (39o) are moved to the take-up side reel stand gear by the bias of the springs (58・) and c3'9・). (6&) and supply side reel matching gear (4&)
On the other hand, when Nobuko (38a) and (351a) follow the peaks x, y, and m, they resist the bias of springs (38・) and (39・). The brake shoes (38a) and (39o) are connected to each gear (3a) and (4m).
) and become inactive.

In addition, the cam plate drive mechanism has a worm (b) that is linked to a motor that can rotate in forward and reverse directions, a worm wheel that meshes with this worm, a by-on that is integrally provided with this worm wheel, and the cam. and a rack formed at the rear end of the plate 0 and meshing with the pinion.

Furthermore, the cam plate position detection mechanism is the 9th V! As shown in FIG. In the illustrated example, the light shielding member is composed of a bottomed cylindrical body made of metal or plastic, and has a plurality of through holes in its outer peripheral wall. has. That is, as is well shown in FIG. 10, the outer circumferential wall of the bottomed cylindrical body is divided into two sections vertically and four sections in the circumferential direction. One through hole (56m) to (56a) is formed in each of the upper and lower sections. In this case, the first section B is in stop mode (820F), and the second section B is in stop mode (820F).
corresponds to fast forward and rewind commands (177RIW), the third section 0 corresponds to cueing mode (OUR), and the fourth section corresponds to recording/reproducing mode (1'LAY/m10). Note that this bottomed cylindrical body is fixed to the upper end of the support shaft of the worm wheel described above. Further, the light receiving section is composed of a pair of upper and lower light receiving elements (52&) and (5211) arranged corresponding to the upper and lower sections of the bottomed cylindrical body, and these light receiving elements (52&) and (52b) The optical signal is sensed to generate an electrical signal, and the signal is input to the mode detection section. Therefore, when both light receiving elements (52m) and (52b) do not detect light, the mode is stopped, when only the upper light receiving element (52m) detects light, the mode is fast forwarding and rewinding, and when the lower light receiving element (52b) detects light, the mode is stopped. When only one detects light, cue mode is activated, and both light receiving elements (52m).

(52k) detects light, each signal of the recording/reproduction mode V is manually inputted to the mode detection section -. in this case,
For example, if the motor is set so that it rotates in the forward direction when a command to shift from the stop mode to another mode is given, and in the recording/reproducing mode, it rotates in the reverse direction, the recreational operation can be prevented.

In addition, between the fast forward and rewind modes and the cue mode, and between the cue mode and the recording/playback mode, there is a portion 1.1 in which neither of the light receiving elements (52m) and (52b) receives light. However, when the light receiving elements (52m) and (52b) correspond to this portion 1.1, a stop mode signal is input to the mode detection section -, and the rotation of the motor is stopped as a stop mode. However, when approaching the dormitory, due to the rotational inertia of the motor (the cylinder with a bottom), the motor overruns and enters the next mode and stops. Therefore, if the mode is a desired mode, the motor continues to be stopped; if the mode is a different mode, the motor continues to rotate and stops at the desired mode position. In order to perform such an operation, it is necessary to set the portion 1.1 to a width commensurate with the inertial rotation position of the motor.

Next, in Figs. 51W to 7, Fig. 5 corresponds to Fig. 1, and Fig. 7 corresponds to Fig. 4ri4. In these, - is a magnetic head, - is this magnetic head (b) and/or
The head plate, which indicates the head plate on which the li* head is attached, is arranged so as to cover the upper surface of the cam plate (2), and is attached to the base plate (2) by means of guide roller wheels provided at each corner of the head plate. 2) It is configured to be able to reciprocate on the top in a direction perpendicular to the sliding direction of the cam plate (2).

Also, between this head plate and the board (2),
A spring is interposed that constantly biases the head plate in the backward direction. Further, there are pairs of cut and raised pieces (62a), (62b) and (6) on the left and right sides of the front edge of the head plate.
3m) and (63b) are provided, and these cut and raised pieces (63b) are provided.
2m), (62b) and (63m), (63b), springs (62o) and (63o) are locked from the outside. 9. The swinging arm of the pinch roller 1 (foundation) fights against these springs (62o) and (63o).
- are provided with spring receiving pieces (62(L), (656)).

In addition, (62・), (63・) are springs (62・), (6
30) Cut and raised piece to support, N, $411. IIM, H
respectively) and M% capstan shaft (5) *
This is a through hole to prevent the rotation support shafts -0- of (a) and the pinch reelers (b) and (b) from interfering with the head plate. Further, a pin is provided in the center of the head plate, and this pin is connected to the cam plate ψ.
The sixth cam part provided at 0 is made to follow. This sixth
The cam part consists of two second cam parts (45m) and (45b).
It has an intermediate stage section (69m) for cueing and a final stage section (69b) for recording and playback.

In this case, the operation timing of each point is determined by the first cam part (45m), (45b) and the third cam part (-) explained above.

Next, the operation will be explained.

FIGS. 1 and 5 show how the cassette 0 is attached to and removed from the main body (1) of the magnetic recording/reproducing apparatus. That is, the mode detection Mk- detects the stop mode signal 10, the idler gear aη meshes with both the binion and the rack (9) by the action of the positioning device ll-, and the take-up side reel stand gear ( It is held at a neutral position where it does not mesh with either the supply side reel stand gear (4&) or the supply side reel stand gear (4&). Therefore, the stopper plate is also held at a position where it does not protrude into the swing path of any of the rotation support shafts -1. Also, the cam play (Ill) is held at the backward limit by the cam plate drive mechanism (b), and its first force (5) is disconnected from Nobuko (Tsai) of the plate link.

Sarani, Sei tm*4m, HtD imitator Nobuko 8a), (
59a) The first trough portions 1 of the 112 cam portions (45m) and (45b) are made to follow, and the Nobuko of the first head plate is made to follow the trough portions of the fifth cam g-. Therefore, the braking mechanism-1 is activated to brake the take-up reel stand (3) and the supply reel stand (4), and the head plate or magnetic head is positioned at the backward limit.

FIG. 2 shows a state in which, for example, the magnetic tape is rapidly forwarded in the normal direction after the cassette 0 is installed. In other words, in the case of , the pinion (
2) rotates in the direction of the arrow, the idler gear (B) rotates and kicks the rack (2), in other words, it is prevented from being fed by the rack (TO), and the take-up reel stand gear ( 6&). Along with this,
The plate link (2) swings clockwise against the bias of the positioning mechanism (2), and at the same time, the cam plate drive mechanism (B) starts and the cam plate (2) moves forward in the direction of arrow B.

Second cam part of cam plate 0 (45m), (45b)
(to the braking mechanism on the first mountain part X), Nobuko of Qll (381
1), (When 39 (1) is followed, the bottomed cylindrical body -
The upper through hole (56 &) of the second section B corresponds to the upper light receiving element (52m), and only this light receiving element (52m) detects light and a fast forward mode signal is input to the mode detection section -, and this screen - The operation of the cam plate drive mechanism (2) is stopped by a signal from the code detection shaft. At the same time, Nobuko (Taiwan) of the plate link is forced by the first power unit (5), so the idler gear (B) separates from the rack (B) and meshes with the other reel stand gear (3 &) on the winding side. It will continue to rotate in this state. Therefore, the take-up side reel base gear (ga) rotates in the direction of arrow 0, and the magnetic tape is rapidly fed in the normal direction.

FIGS. 6 and 5 show the state when the magnetic tape is played back after being fast-forwarded in the normal direction.

It is shown in Figure fa4 and Figure 7. That is, when the cam plate ρ is advanced by starting the force plate drive mechanism (b), as shown in FIG. (45m), (4
5b) Take-up side reel stand (8) and supply side reel stand (4)
), the rapid forward rotation of the cam plate gate is stopped, and the cam plate gate continues to move forward, and as shown in Fig. 5, the #N2 force 5 part (
45a), (+ to 45) second peak F&: the copying element Nobuko 81), (3?d) is made to copy, and the braking state is released. The cam plate San〇 continued to advance further after that, and as shown in Figures 4 and 7, the front ε Nobuko (
38 & ) - (59d) KawiZ force A &ls (
45m) # (45b) It is made to follow the third mountain part 2. In this state, the position of cam plate 〇 is the upper and lower through holes (56 (1), (5
It is detected by both the light receiving elements (52m) and (52b) corresponding to 6a), and the operation of the cam plate drive mechanism (b) is stopped by the detection signal from the mode detection section -, and the forward movement of the cam plate ψ0 is also stopped. . In this state, the take-up side reel stand gear (3 &) and the supply side reel stand gear (4 &)
a) & The pair of braking states is released. Meanwhile, during the above-mentioned series of operations, Nobuko of Het Frey
passes through the intermediate stage part (69a) of the fifth cam part - to the final stage g (
69m)).

Therefore, the magnetic head moves forward together with the head plate as shown by the arrows in FIGS. 6 and 7, and the magnetic head □ comes into contact with the magnetic tape. Also, as the head plate moves forward, the springs (62o) and (63) provided on the head plate are activated by the spring receiving pieces (62a) and (63) of the pinch roller swinging arms H and m. 634), energizes the pinch reeler) and @. In this case, the support shaft 8N moves together with the head plate while being locked to one end edge of the square hole 1H. One end of the stopper plate protrudes into the path and engages with its support shaft, so even with the biasing mentioned above,
The normal direction pinch roller is prevented from swinging before it comes into pressure contact with the capstan shaft (6).

Therefore, when the head plate reaches its travel limit, only the capstan shaft (in the normal direction pinch 4) is
5) is elastically pressed against. This state is shown in Figures 4 and 7V! Shown in i.

In the states shown in FIGS. 4 and 7, the magnetic tape is fed in the normal direction according to the rotational speed of the middle Yapstan shaft (6).
Also, the take-up side reel stand (3) and the supply side reel stand (4)
rotates in synchronization with the winding speed and feeding speed of the magnetic tape,
The winding torque at that time remains constant.

In other words, the output of the forward and reverse rotation main body Sakaki (7) taken out by Above, we have explained the case where the electromagnetic tape is fast-forwarded in the normal direction and then fed steadily in the same direction, but in this type of magnetic recording/reproducing device, fast-forwarding in the normal direction, Steady forwarding and stopping 1 Fast forwarding in the rewinding direction, steady feeding and stopping, and even cueing are performed in any order. Therefore, as a countermeasure, when moving from one operation to the next, temporarily remove one cam plate (b) from the
It is desirable to have a configuration that returns to the retraction limit as shown in the figure, but this more flexible configuration can be easily adopted, for example, by using a micro combinator.

In addition, if it becomes necessary to remove the micro cassette 0 due to power failure (11E battery) while the magnetic tape is running, you can manually move the cam plate back by turning the universal dial. Return to Iiii,
Middle Yapsutan shafts (5), (6) and Vinci roller (B),
), remove the micro cassette 0, and then remove the idler gear α.
This manual mechanism is also used when adjusting the meshing of η with the take-up side reel stand gear (6&) and the supply side reel stand gear (4&).

That is, for example, as shown in FIG.
, ) are engaged with the take-up side reel stand gear (6&), the cam play 10 is returned to the backward limit by the manual mechanism to brake this take-up side reel stand gear (5&), and then the same Perform the operation on the supply side reel stand gear (4&).

As is clear from the above description, according to the present invention, it is possible to detect each mode state not by mechanical detection of each mode state but by an optical method, so that failures due to wear of the detection member etc. It does not cause problems such as malfunctions due to overruns or overruns, or deterioration of positioning accuracy due to backlash peculiar to mechanical switches. Therefore, it is used in devices that incorporate microcomputers and perform electronic control. Good results are obtained. Also,
The light source can be used not only for primary mode detection, but also as a pilot lamp for indicating the operating and non-operating states of one master. In this case, when the stop mode is entered, the specified in-flight time (for example, 1 second)
It is also possible to turn off the light source and display the stop mode after the elapse of time. This can prevent power source (battery) consumption.

[Brief explanation of drawings]

The drawing is 1ji of this invention! This shows a magnetic recording/reproducing device according to an embodiment, and FIGS. 1 to 7 are partially cutaway plan views for explaining the operating state thereof, and FIG. 81i! ! 9 is a schematic perspective view of the main parts, FIG. 10 is a developed view of the light shielding member, and FIG. 11 is an explanatory view. (1) - Magnetic recording/reproducing device main body, (2) - Substrate, (8) - Take-up reel stand, (6 &) - Take-up reel stand gear - (4) -・Supply side reel stand, (4&
)... Supply side reel stand gear, (5), (6) - Capstan shaft, (γ)... Forward/reverse rotation drive mechanism - (7m
)...output shaft, (2)...binion, (to)...
Rack, αη...idler gear, deer...power plate, (b)...cam plate drive mechanism, Sakaki...
Cam plate position detection mechanism, ---magnetic head, Fi
Me...Light source, - Light receiving section (52m). (52b)... Light receiving element, ring... Light shielding member%...
・Mode detection unit, )...bottomed cylindrical body, @ , (5
6m) ~(56(1) ”-through hole. In the diagram, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno (1 other person) 17

Claims (1)

[Scope of Claims] (1) A light source, a light receiving section facing the light source, and a light receiving section provided between the light source and the light receiving section, and capable of stopping, recording/playing, fast forwarding, rewinding, cueing, etc. the magnetic tape. a light shielding member that changes the amount of transmitted light in response to switching of the mode state; a mode detection unit that detects which mode the mode state is based on a change in the light density received by the light receiving unit; and a mode switching mechanism that switches the mode in response to a command signal from the magnetic recording and reproducing device. (2) A cylinder in which the light shielding member surrounds the light source and rotates around the light source in response to switching of each mode state. (8) A light shielding member surrounds the light source and the light is in each mode state. Claim 1: A cylindrical body that rotates in response to the switching of the cylindrical body is formed with different through holes in a light blocking portion corresponding to one specific mode and a transmitting light cover corresponding to each other mode. The magnetic recording and reproducing device described in . (4) The magnetic recording and reproducing apparatus according to claim 6, wherein one particular mode is a magnetic tape stop mode.