JPH01199377A - Cassette - Google Patents

Abstract

PURPOSE:To designate an area of a tape and then to perform an ON/OFF operation of a light receiving element by structuring the above cassette in such a manner that the cassette is provided with a slide lever for moving according to an r.p.m. of a reel, and a beam of light is passed through a translucent window provided to the cassette before the light receiving element receives this beam of light from a light emitting element above the slide lever. CONSTITUTION:Each time a reel 7 on the supply side rotates one revolution, the slide layer 12 is moved by gears 9-11 by one tooth of the slide lever 12. Consequently, a light path that is bent vertically by prisms 17 and 15 and a half-mirror 16 is moved right and left according to a tape winding amt. of the reel on the supply side. Then, a translucent window part 14 is provided with scale in a moving position of the prism 17 which moves at a fixed interval, and obstacles, such as seals, etc., are stuck to the translucent window part to follow the scale, so that such a light path 18 between the light emitting element 30 and light receiving element 32 as located in an area of the presence of the tape is interrupted not to enable the light receiving element 32 to receive the light. By this method, a partial edit can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cassette containing a reel wound with tape.

[Prior Art] Conventionally, in cassettes that store reels wound with tape, automatic editing to prevent accidental erasure has been performed on a cassette-by-cassette basis by providing a mechanism to detect the presence or absence of accidental erasure prevention claws and detection holes. It is composed of Further, partial editing of the tape is performed on the device into which the cassette is loaded. For example, the location where the current operation is being performed is detected from the number of rotations of the reels, and the mode operation is performed in accordance with the editing method recorded on the device side.

Another method that has been considered is to record the editing method directly on the magnetic tape and perform mode operations according to the recorded method.

[Problems to be Solved by the Invention] In the conventional cassettes as described above, automatic editing to prevent accidental erasure is performed using a claw or detection hole provided in each cassette. Therefore, there is a problem in that partial editing of one cassette, so-called area editing, is not possible. Also.

When performing this area editing on the side where the cassette is installed, it is necessary to take into account information specific to the tape, such as recording time, reel hub diameter, etc., in order to calculate the current operating location from the reel rotation speed or speed. However, the circuit becomes complicated. Furthermore, since the editing method is recorded on the device side, the editing method is not saved when the cassette is replaced.

Furthermore, although the method of directly recording the editing method on magnetic tape allows for very accurate area editing, there is a problem in that if the editing method is to be rewritten, it must be played back and recorded on the device at least once. there were.

This problem was made in order to solve this problem, and it is sufficient to provide a cassette that can perform partial editing with a simple configuration without providing any special functions to the device into which the cassette is installed. purpose.

[Means for Solving the Problem] In order to achieve the above object, the cassette of the present invention has the following features:
Two through holes are provided on the side of the cassette, and a slide lever that moves according to the rotational speed of one of the reels is provided, and furthermore, light that passes through the one through hole and enters in the horizontal direction is placed on the slide lever. The light from the first means is reflected through a first means for vertically reflecting the light, and a translucent window provided on the cassette surface in a portion that becomes the optical path of the light reflected from the first means. a reflection mechanism provided outside the cassette to make the light incident again in the vertical direction, and a second means for reflecting the light incident from the vertical direction in a horizontal direction having a different height from the horizontal direction. an optical member provided with the
Forming an optical path in which light from a light emitting element provided on one side of the cassette can pass through an arbitrary position of the transparent window on the top surface of the cassette and be received by a light receiving element provided on the other side. This is what I did.

[Function] According to the present invention, a mechanism is provided on the slide lever that detects the location of the tape currently being operated and bends the optical path by providing the cassette with a slide lever that moves according to the number of rotations of the reel. Then, an optical path passing through a part of the transparent window of the cassette half is formed, and the editing method can be selected using the 0N10FF information of the optical path.

[Example] The present invention will be described below based on the example shown in FIGS. 1 to 3.

FIG. 1 is a front view of a cassette according to an embodiment of the present invention, with the top surface 13 of the cassette removed and a portion of the supply reel removed. In Figure 1,
1 is the lower surface of the cassette, 2 is the tape wound on the reel 7.8, 9 is a one-tooth gear provided on the supply reel, and gear 1 engages with the gear lO every time the reel 7 rotates once.
0 is lightly held down by the positioning spring 19 and rotates only by the feed of the gear 9. Also, gear lO is gear 11
to move the slide lever 12. Also,
FIG. 2 is a sectional view of the rear part of FIG. 1, mainly showing the optical path. On the slide lever 12 shown in FIG. 1, there is an eight-view mirror 16 and a prism 17 shown in FIG.
15 are pasted together. Further, a translucent window 14 is provided in the prism movement range of the upper case, and through holes 5 and 6 for an optical path are provided in the side surface of the cassette. 30 in Figure 2
．． 31 and 32 are light emitting elements provided in the device for mounting the cassette.

They are a reflector and a light receiving element. FIG. 3 is a side sectional view of FIG. 1, showing the meshing of gears 9, 10, and 11.

Next, the mechanism of this embodiment will be explained according to FIGS. 1 to 3.

First, the light 18 emitted from the light emitting element 30 passes through the through hole 5 provided on the side of the cassette, and passes through the prism 17. Entering the first means consisting of a half mirror 16. The light then enters the prism 17, is reflected by the half mirror 16, travels above the cassette, passes through the translucent window 14, is reflected by the reflector 31, and enters the prism 17 again. The above light is transmitted from the 8th mirror 16. The light enters the second means consisting of a prism 15, first passes through a half mirror 16, enters the prism 15, and is reflected by the prism 15.
The light 18 travels in the horizontal direction, and further passes through the through hole 6 on the side of the cassette.
The prism 17.1 reaches the light receiving element 32 through the prism 17.1.
5 and the half mirror 16 are provided on the slide lever 12, but since the slide lever 12 slides in the direction in which the light is incident, it does not affect the above-mentioned optical path. On the other hand, the slide lever 12 is moved by one tooth of the slide lever 12 by the gear 9.degree. 10.11 every time the supply reel 7 rotates once. Therefore, the optical path bent in the vertical direction by the prisms 17, 15 and the half mirror 16 moves left and right depending on the amount of tape wound on the supply reel. Further, a scale is provided on the translucent window 14 at the position of the moving prism 17 at a fixed time interval, for example, every 10 minutes, and an obstacle such as a sticker is pasted on the translucent window 14 using the scale as a guide. As a result, the optical path 18 between the light emitting element 30 and the light receiving element 32 in the area where the tape is located is blocked, and the light receiving element 32 is unable to receive light. In other words, an arbitrary section of the tape can be specified by inserting an obstacle between the light-transmitting windows 14, and the apparatus can detect this because the light-receiving element does not react.

In this embodiment, since the structure uses a prism or the like, the structure is simple, and the tape cassette is only thicker in the thickness direction by the thickness of the gear 10, making it sufficiently compact. Furthermore, since the difference in the optical path 18 does not change due to the movement of the prisms 15 and 17, the light receiving element 32
The probability of malfunction is also reduced.

FIG. 4 is a sectional view of the rear part of the cassette showing another embodiment. The explanation will be given below according to FIG.

The basic structure, that is, the method of driving the slide lever 52, etc., is the same as in the previous embodiment, but the through hole 45 for the light emitting element 70 and the through hole 46 for the light receiving element 72 are connected to the side surface 43 on the supply side. The prisms 55 and 57 and the half mirror 56 reflect light in the same direction. As a result, the distance from the light emitting element 70 to the prism 55 and the distance from the prism 57 to the light receiving element 72 are shortened, the optical path is shortened, and light loss is reduced. Therefore, there is an effect that malfunctions are even more difficult to occur.

[Effects of the Invention] As explained above, the present invention provides the cassette with a slide lever that moves in accordance with the number of rotations of the reel. By having a structure in which light passes through a translucent window provided in the tape, it was possible to perform 0N10FF of the light receiving element by specifying an area of the tape. If this is incorporated into an erroneous erasure prevention circuit, it will be possible to prevent erroneous erasure of designated areas. In addition, in the present invention, this area is designated by pasting stickers etc. using the scale provided with the translucent window as a guide, so if the general location is known,
Areas can be specified without having to take the trouble of installing a cassette in the recording/reproducing device, and furthermore, the area can be specified very easily since the seal can be removed to cancel the operation. Furthermore, the problem of modifying the circuit that detects the tape position from the reel rotation speed due to values specific to the tape, such as recording length and reel hub diameter, can be resolved by using the scale provided on the translucent window. will be done.

[Brief explanation of the drawing]

FIG. 1 is a front view of a cassette according to an embodiment of the present invention, FIG. 2 is a sectional view of the rear part of FIG. 1, FIG. 3 is a side sectional view of FIG. 1, and FIG. 4 is another embodiment. FIG. 3 is a sectional view of the rear part of the cassette. In the figure. l: Lower surface 5, 6: Through hole 7.8: Reel 9 knee tooth gear 10.11: Gear 12 Nishiride lever 13:
Top surface 14: Translucent window 15 17: Prism 16: Half mirror 18: Optical path 30:
Light-emitting element 31: Reflector plate 32: Light-receiving element Representative Patent attorney 1) Haruichi Kitatake 1', - 2r5

Claims (1)

[Claims] In a cassette that stores two reels wound with tape, two through holes are provided on the side of the cassette, and a slide lever that moves according to the number of rotations of one of the reels is provided, and furthermore, on this slide lever, A first reflector that reflects the light incident in the horizontal direction through the one through hole in the vertical direction.
and a translucent window provided on the cassette surface in a portion that becomes the optical path of the light reflected from the first means,
The light from the first means is reflected by a reflection mechanism provided outside the cassette to be incident again in the vertical direction, and the light incident from the vertical direction is directed into a horizontal direction at a different height from the horizontal direction. an optical member having a second reflecting means is provided, and the light from the light emitting element provided on one side of the cassette is passed through an arbitrary position of the transparent window on the top surface of the cassette, and the light from the light emitting element provided on one side of the cassette is passed through an arbitrary position of the transparent window on the top surface of the cassette. A cassette characterized by forming an optical path through which light can be received by a light receiving element provided on a side surface.