JPH0652592B2 - Recording / playback device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a tape cassette having detection tapes having different light transmittances from the tape at the beginning and the end of the tape, and a pair of light emitting and receiving elements through the tapes. The present invention relates to a recording / reproducing apparatus capable of using a plurality of types of tape cassettes, in particular, for stopping the tape running by detecting the presence or absence of light transmission.

2. Description of the Related Art As an apparatus of this type, the present applicant has previously filed Japanese Patent Application No. 60-149.
No. 00 specification is proposed. That is, as shown in the rear perspective view of FIG. 7, an opening 102 is provided on the bottom surface 100 'of the standard tape cassette 100 inside the tape 101 stretched on the front surface. When the tape 101 is mounted on the device, the front lid 103 and the back lid 104, which cover the tape 101 from the front and back surfaces, are rotated to expose the tape 101 and a post (not shown) inserted into the opening 102. The tape 101 to the standard tape cassette 10
It is pulled out from 0, wound around a tape guide cylinder 109 containing a transducer as shown in FIG. On the other hand, the beginning and end of the tape 101 is
The winding and supply reels 1 are respectively connected via a detection tape (for example, a transparent tape) having a light transmittance different from that of the tape 101.
It is locked to 05 and 106.

Also, a hole 1 is formed on the bottom surface 100 'of the standard tape cassette 100.
07 is provided. Then, as shown in FIG. 8, the light emitting element 111 provided in the device 110 is inserted into the hole 107,
A light receiving element 112 provided outside the tape cassette 100,
Optical paths 114 and 115 are formed between the optical path 113 and 113. Light path 1
14 and 115 are simultaneously formed via a tape 101 stretched inside the standard tape cassette 100. When the normal tape 101 travels in the optical paths 114 and 115, for example, the light is blocked and the tape 101 and the light are transmitted. For example, when a transparent detection tape (not shown) travels, the optical paths 114 or 115 are formed, and the start or end of the tape 101 is detected by the signal of the light receiving element 112 or 113. It controls to stop the traveling of the vehicle.

On the other hand, as opposed to the standard tape cassette 100, a short time tape cassette 116 as shown in a rear perspective view in FIG. 9 is conceivable. This is the opening 1 of the standard tape cassette 100.
02 (indicated by a broken line in the figure)
17 and the supply reel 118 have an opening 119 expanded corresponding to the smaller diameter of the flange. Other external dimensions, structure, etc. are the same and can be mounted and used in a device for the standard tape cassette 100. It is so-called compatible with each other. It should be noted that the opening 12 has a recess 12
0, and a transparent portion 119 'for forming an optical path is provided on the wall surface of the opening 119.
They are provided on the 17 side respectively. After being installed in the apparatus 110 shown in FIG. 8, the entire tape path system including the tape guide 109 as shown in FIG.
It is possible to realize a so-called cassette-sized recording / reproducing apparatus as a whole by making the recording medium 9 enter the inside of the apparatus. In this case, the optical paths 120 and 121 for detecting the tape start and end are the light emitting element 111 moved from the position shown in FIG. 8, the optical path holes 116 'and the optical path holes 116' which are also provided in the standard tape cassette 100 (not shown). Optical path hole 10 provided in front cover 103
It is formed between the light receiving elements 112 and 113 via 3 '.

The movement of the light emitting element 111 will be described with reference to FIGS. 11 and 12. The light emitting element 111 is installed on the arm 122, and the arm 122 is rotatable about a shaft 123 and is rotated by a spring (not shown). It is biased counterclockwise in the figure and positioned by a stopper (not shown). Further, the arm 122 is guided by a guide groove 126 provided on a drive substrate 126 on which the supply reel base 124 and the take-up reel base 125 are mounted, and is configured to be movable in the left-right direction in the drawing. Further, the light receiving elements 112 and 113 are attached to the drive substrate 126 so that the optical paths 112 and 113 for the standard tape cassette 100 can be formed. On the other hand, when the tape cassette 116 is used for a short time, the cylinder substrate 1 on which the tape guide 109 is placed
27 moves so as to be relatively close to the drive substrate 126, and eventually the arm 122 is engaged with the recess 127 ′ on the cylinder substrate 127, while moving along the guide groove 126 and rotating about the shaft 123. To perform. At the same time, as shown in FIG. 12, the arm 1 on which the light emitting device 111 is mounted is mounted.
22 is positioned in a V-shaped groove 126 'provided in the drive substrate 126, and accordingly, the optical paths 120 and 121 for the short-time tape cassette 116 are connected to the light receiving elements 112 and 11.
It is formed between 3 and 3. In this way, the light emitting element 11
When 1 is moved to form new optical paths 120 and 121, there are the following problems.

That is, the light emission and light reception angles of the light emitting / receiving element change with respect to a predetermined optical path. On the other hand, although it may be possible to adopt a filament type light emitting element having a large light emitting angle as the light emitting element, the filament type consumes much more power than a light emitting diode or the like, and is not suitable for a portable device having a battery specification. Appropriate. Also,
Light emitting diodes with relatively wide emission angles are back to back 2
It seems that it is possible to use them individually, but with this, the effective emission angle to the light receiving surface is limited to the optical path hole of the tape cassette, and at the same time, the emission angle characteristics also show a sharp decrease in the light amount as the angle increases. It is easy to cause a malfunction in the received light detection. On the other hand, it is also possible to adopt a light receiving element having a weak light receiving directivity, that is, a light receiving element having a wide light receiving range, but in this case, it is easy to receive light from the outside of the device,
It causes a large malfunction. On the other hand, the amount of light is also limited to the optical path hole of the tape cassette, and the detection function of the beginning and end of the tape is extremely unstable. Therefore, a plurality of light emitting and receiving elements having such a set of strong directivity are used. It has been extremely difficult to stably detect the beginning and end of a tape in various types of tape cassettes.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In response to such a problem, the present invention uses the same light emitting / receiving element having low power consumption and strong directivity, and uses all the tapes to be incorporated in a plurality of tape cassettes. The purpose is to perform stable edge detection.

Means for Solving the Problems To solve the above problems, the present invention forms a first optical path through a tape stretched in a first tape cassette and stretches it in a second tape cassette. Optical path forming means comprising a light emitting element arranged inside the recording / reproducing apparatus and a light receiving element arranged outside the recording / reproducing apparatus so as to form a second optical path through the tape, and a second optical path. Forming a second optical path via a tape stretched in a second tape cassette forming a moving means for moving the light emitting element, and means for directing the light receiving element in the second optical path direction. The present invention provides a recording / reproducing device characterized by having:

Operation That is, when forming the second optical path from the first optical path by the same light emitting element and light receiving element, move either one of the light emitting and receiving elements and rotate at least one of them in the direction of the second optical path. To detect a sufficient light detection output with low power consumption and reduce malfunctions,
This is achieved by using a highly directional light receiving element.

EXAMPLES Hereinafter, the present invention will be described in detail based on examples. FIG. 1 is a diagram showing the operating principle of an embodiment of the present invention. Since the tape cassette used in the following description is the same as that described in the conventional example, the same portions are denoted by the same reference numerals for easy understanding. In FIG. 1, the drive substrate 1
When the standard tape cassette 100 or the short-time tape cassette 116 is mounted on the top, the X
Tape guide cylinder 3 at a remote position corresponding to + Y
There is a cylinder substrate on which is mounted. The bottom surface 10 of the standard tape cassette 100 (see FIG. 7) accompanying this mounting operation
The light emitting elements 4 and 6 provided on the drive substrate 1 enter back to back at positions corresponding to the holes 107 provided at 0 '. Similarly, the light receiving elements 5 and 7 are symmetrically provided on the drive substrate 1 at positions at an angle of θ ₁ in the drawing with respect to the longitudinal direction of the standard tape cassette 100. Then, the optical path 1 is respectively formed by the pairs of light emitting and receiving elements 4, 5 and 6, 7 via the tape 101 which is stretched in the standard tape cassette 100 or the short time tape cassette 116, respectively.
2 and 13 are formed. It is of course possible to wind the tape 101 around the tape guide cylinder 3 at this position and run the tape as in a conventionally known example.
When the standard tape cassette 100 is used, the cylinder substrate 2 is brought close to the drive substrate 1 by X in the drawing, and the tape guide cylinder 3 is opened in the opening 102 of the standard tape cassette 100.
It is also possible to allow the tape to run by making it enter into the range of (1) to downsize the entire device. At this time, the start and end of the tape 101 can be detected naturally because the optical paths 12 and 13 are formed. On the other hand, the short time tape cassette 116
When using, the opening 119 is larger, so that it is possible to move the tape by bringing the relative positions of the cylinder substrate 2 and the drive substrate 1 close to each other by X + Y in the drawing. In that case, the light emitting elements 4 and 6 are moved by Z in the figure, and the light emitting elements are rotated in the directions of arrows 10 and 11, respectively, so as to be θ with respect to the longitudinal direction of the tape cassette 116 for a short time.
Change to make an angle of ₂ . On the other hand, the light receiving elements 5 and 7 are rotated by the arrows 8 and 9, respectively, and the optical paths 14 and 15 are respectively directed to the light emitting directions of the light emitting elements 4 and 6 after the movement.
Is also formed.

FIG. 2 is a partially exploded perspective view showing a specific configuration example based on the operation principle of FIG. In FIG. 2, the drive board 1 includes a supply reel stand 16, a take-up reel stand 17, and a capstan 1.
8, standard and short time tape cassettes 100 and 11
The main components necessary for running the tape 101, such as the positioning of 6 and the height determining posts (19 and 20 respectively), are placed, and at the same time, the guide shafts 23 and 24 held by the holding members 21 and 22 are attached. There is. And, on the cylinder substrate 2 on which the tape guide cylinder 3 is mounted,
Guide members 25 and 26, which are slidably guided by the guide shafts 23 and 24, are mounted to enable relative movement of the cylinder substrate 2 with respect to the drive substrate 1 and separation operation.

Further, the light emitting element mounting base 27 mounts the light emitting elements 4 and 6,
The long holes 2 are formed by the guide pins 28 fixed to the drive board 1.
At the same time as being guided by 7a, the folded portions 27b, 27e
The shaft 24 is engaged with a hole provided in the guide member 26 at a position where the guide member 26 provided on the cylinder substrate 2 is sandwiched. Further, the light emitting element mounting base 27 has recesses 27c and 27d, and is configured to engage with a leaf spring 29 fixed to the drive substrate 1. Then, the drive substrate 1 of the cylinder substrate 2
1 is in the relative position corresponding to X + Y in FIG. 1, the leaf spring 29 engages with the concave portion 27c to position the light emitting element mounting base 27 and consequently positions the light emitting elements 4 and 6. When the cylinder substrate 2 moves by X shown in FIG. 1, the guide member 26 is moved along the shaft 24 by the arrow 3
Although it moves in the 0 direction, it does not come into contact with the folded portion 27e, and the positions of the light emitting elements 4 and 6 do not change at all.

Further, when the cylinder substrate 2 is moved by the amount corresponding to X + Y in FIG. 1, the guide member 26 causes the folding portion 27e.
And the light-emitting element mounting base 27 is moved in the direction of an arrow 30 in the figure against the leaf spring 29, and soon the leaf spring 29 is depressed.
Positioning is performed by engaging with 7d. On the other hand, the light emitting elements 4 and 6 mounted on the light emitting element mounting base 27 are shown in FIGS.
As shown in detail in the figure, the holder 3 which is rotated about the shaft 31 and is biased by the spring 32 in the direction of approaching the holder 3
It is attached to 3,34. Then, when the cylinder substrate 2 moves to a position corresponding to X + Y in FIG. 1, the contact guide member 35 provided on the drive substrate 1 eventually.
Moves relative to the position shown in FIG. 4 from the state shown in FIG.
By rotating the holders 33 and 34 against the above, the light emitting direction is changed from θ _{1 in} FIG. 3 to θ ₂ in FIG. It is obvious that when the cylinder substrate 2 is separated from the drive substrate 1 in reverse, the state from FIG. 4 to FIG. 3 is set, but during that time, the light emitting element mounting base 27 shown in FIG. Indicates that the original movement range corresponding to Y in FIG. 1 is stopped, and eventually the guide member 26 comes into contact with the folding down portion 27b, moves with it, and returns to the position in FIG. is there. Next, a configuration example of a means for making the light emitting elements 5 and 7 face the light emitting elements 4 and 6 will be described with reference to FIGS. 2, 5, and 6.

The light receiving element 5 (see FIG. 1) has the same rotating means as the light receiving element 7 arranged on the supply reel base 16 side, and only the configuration on the light receiving element 7 side will be described.

In FIG. 2, the light receiving element 7 is pivotally supported on the drive substrate 1 and is attached to a holder 38 which is brought into contact with and positioned by a projection 39a of a cassette detection lever 39 which is biased by a torsion coil spring 36 in the direction of arrow 37 in the figure. Has been. The cassette detection lever 39 is pivotally supported on a part of the drive board 1 and is biased by a torsion coil spring 40 in the direction of an arrow 41 in the drawing so that the rotation position is a stopper portion which is a part of the drive board 1. It is regulated by 1a. Then, as shown in partially enlarged views in FIGS. 5 and 6, one folding portion 39a of the cassette detection lever 39 is in a position to engage with the holder 38, and the other folding portion 39b is the bottom surface of the standard tape cassette 100. The short-time tape cassette 116 that abuts on the opening 119 and is enlarged, is located at a position corresponding to the inside of the opening 119. Therefore, when the tape cassette is not installed or when the tape cassette 116 is installed for a short time, the cassette detection lever 3
9 does not rotate, and the position of the light receiving element 7 does not change and forms the optical path 15 having an angle of θ ₂ in FIG. 1. However, when the standard tape cassette 100 is mounted, the cassette detection lever 39 Rotates to move the holder 38 in the direction of arrow 42. Since the light-receiving element 7 is biased in the 37 direction by the torsion coil spring 36, the light-receiving element 7 is moved in the direction of the arrow 42 so that the light-receiving element 7 becomes a standard tape cassette 10.
It is opposed to the light emitting element 6 that has moved with the mounting of 0,
It is obvious that the same method can be used to form the optical paths 12 and 14 on the take-up reel stand 17 side.

As described above, in the embodiment of the present invention, the light emitting element is not only moved but also rotated. However, for example, in a stationary apparatus that can use a commercial power source regardless of power consumption, a filament type light emitting element or If a sufficient amount of current is passed through the light emitting element having a weak directivity to obtain the amount of light, it may be possible without rotating the light emitting element. However, even in this case, the light receiving element leaks, and the rotating means is extremely effective because it is necessary to use an element having a strong directivity in order to prevent malfunction due to the influence of external light. It is obvious that even if the positions of the light emitting element and the light receiving element are exchanged in the embodiment, there is no problem if the light emitting element is opposed to the light receiving element.

As described above, according to the present invention, a plurality of types of tape cassettes are used, and the detection of the beginning and the end of each tape is extremely stable with a pair of light emitting / receiving elements having low power consumption and strong directivity. It is something that can be done.

[Brief description of drawings]

FIG. 1 is an explanatory view of the operating principle of the embodiment according to the present invention, FIG. 2 is a partially exploded perspective view of the embodiment, and FIGS. 3, 4, 5
FIGS. 6 and 6 are partial detailed operation explanatory views of the same main part, FIG. 7 is a rear perspective view of a standard tape cassette applied to the present invention, FIG. 8 is a plan view showing a conventional example, and FIG. 10 is a rear perspective view of the short-time tape cassette applied to the present invention.
FIG. 11 is a plan view showing a conventional example, and FIGS. 11 and 12 are plan views for explaining the operation of the main part of the conventional example. 4, 6 ... Light emitting element, 5, 7 ... Light receiving element, 12, 13,
14, 15 ... Optical path, 100 ... Standard tape cassette,
101 ... tape, 116 ... tape tape cassette.

Claims (2)

[Claims] 1. A first optical path is formed via a tape stretched in a first tape cassette, and a second optical path is formed via a tape stretched in a second tape cassette. Therefore, an optical path forming means comprising a light emitting element arranged inside the recording / reproducing apparatus and a light receiving element arranged outside the recording / reproducing apparatus, and a movement for moving the light emitting element when forming the second optical path. A recording / reproducing apparatus comprising means and means for directing the light receiving element in the second optical path direction. 2. A first optical path is formed via a tape stretched in a first tape cassette, and a second optical path is formed via a tape stretched in a second tape cassette. Therefore, an optical path forming means including a light receiving element arranged inside the recording / reproducing apparatus and a light emitting element arranged outside the recording / reproducing apparatus, and a movement for moving the light receiving element when forming the second optical path. A recording / reproducing apparatus comprising means and means for directing the light receiving element in the second optical path direction.