JPH09180296A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the misidentification caused by the malfunction of a hard side light receiving section sensor such as light leak, to always conduct accurate utilization identification and to improve the reliability while conducting utilization identification by the tape end detection of cassette tape. SOLUTION: In the tape cassette, the end section of a magnetic tape 1, to which magnetic signals are recorded, is connected to a transparent leader tape 2 through a splicing tape 3. A pasted section 10 between the tapes 2 and 3 is provided with an identification means, in which a vertical light shielding section 4 that prevents at least one of the passing of the detection light beam for tape end detection and a transparent section 5 that passes the detection light beam, are formed. By making a<=b where a is the size of the width of a prism A which reflects the light beam from a hard side light emitting section B and b is the size of the width of the section 4, the detection light beam passing inhibit for a tape end detection is accurately made and utilization misidentification is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DAT type tape cassette provided with an application identifying means at a tape end for recording a magnetic signal, and in particular, a DAT (DDS) used for audio and data recording in a cassette of the same shape. ) Type tape cassette.

[0002]

2. Description of the Related Art Conventionally, a tape cassette of this type is used not only for recording audio signals but also for recording other data. However, in order to avoid confusion, the tape end detecting means is used for identifying the purpose. A leader tape is connected to the end of the tape through a splicing tape to provide some kind of application identifying means. That is, when the leader tape crosses the detection optical path, the start end and the end of the tape can be detected, and the audio tape and the data tape can be identified by the vertical stripe light-shielding portion of the splicing tape bonded to the leader tape. Are known.

[0003]

However, in the conventional data tape, if the width dimension of the vertical stripe light-shielding portion is smaller than the width dimension of the prism that reflects the light from the hard side light emitting portion, the light outlet of the prism is lengthened vertically. When the light shielding part passes
There was a problem that the vertical light-shielding portion could not completely cover the prism width and light was leaked, and the hardware-side light-receiving portion sensor malfunctioned, resulting in misidentification. On the other hand, if the amount of light passing through the prism itself is reduced in order to solve this drawback, there is a problem in that the amount of light is insufficient even at the leader tape portion and the tape end cannot be detected easily.
The present invention is intended to eliminate these drawbacks of the related art, and completely blocks light when the vertical light-shielding portion passes through the prism light outlet to prevent malfunction of the sensor of the light-receiving portion on the hardware side, and to identify it. It is an object of the present invention to provide a tape cassette of good quality, the function of which can be greatly improved and the reliability of which can be remarkably enhanced.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a cassette tape in which an end portion of a tape for recording a magnetic signal is connected to a transparent leader tape via a splicing tape. In the tape cassette, which is provided with an identification means in which at least one vertical light-shielding portion for blocking detection light for tape end detection and a transparent portion for transmitting detection light are formed in the bonding portion The width dimension of the vertical light-shielding portion is made larger or equal to the width dimension of the prism that reflects the light from the section. Further, the width dimension of the vertical light-shielding portion is made equal to or greater than the width dimension of the transparent portion, and further, a light passage hole is formed in the side wall of the cassette facing the hard side light source inserted in the notch formed in the cassette. In the tape cassette provided with, the width dimension of the vertical light-shielding portion is larger than or equal to the width dimension of the light passage hole.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the embodiment of the present invention, the vertical dimension is set by setting the width dimension a of the prism for reflecting the light from the hard side light emitting portion and the vertical dimension b of the light shielding portion to be a ≦ b. When the light blocking portion passes through the prism light outlet, the light can be completely blocked, and the malfunction of the hardware side light receiving sensor is eliminated. In addition, the width b of the vertical light-shielding portion and the width c of the transparent portion are
Also by setting ≦ b, the light amount of the transparent portion is reduced and the light shielding property of the vertical light shielding portion is increased to prevent the malfunction of the hardware side light receiving sensor, and as another tape end detection method, the notch portion of the tape cassette is used. There is a method of inserting a light source into the and detecting light from the light passage hole on the side wall of the cassette.
Also in this case, by setting the width dimension b of the vertical light-shielding portion to e ≦ b with respect to the width dimension e of the actual light passage hole excluding the prism light outlet, malfunction of the hardware-side light-receiving portion sensor can be prevented, and identification can be performed. There is no mistake and the reliability of application identification is greatly improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the examples of FIGS. 1 to 3. An end of a magnetic tape 1 for recording a magnetic signal is connected to a transparent leader tape 2 via a splicing tape 3. It is a cassette tape, and the splicing tape 3 has a bonding portion 10 with the leader tape 2, and at least one vertical light-shielding portion 4 for blocking passage of detection light for tape end detection, and a transparent portion 5 for transmitting detection light. In a tape cassette provided with an identification means formed with and, a prism A for reflecting light from the hard side light emitting portion B
And the width dimension b of the vertical light-shielding portion 4 are set to a ≦ b so that the vertical light-shielding portion 4 can completely block light when passing through the prism light outlet.

The vertical light-shielding portions 4 are arranged alternately with the transparent portions 5, and the width dimension b of the vertical light-shielding portions 4 is set.
Is greater than or equal to the width dimension c of the transparent portion 5, that is,
It is effective to reduce the light amount of the transparent portion 5 by b ≧ c and increase the light shielding property of the vertical light shielding portion 4 so as to eliminate misidentification of the hard side light receiving portion B ₁ .

In this case, the vertical light-shielding portion 4 is formed by printing, and as shown in FIG. 1 (c), it is preferable that the undulation amount f generated at the edge of the vertical light-shielding portion is small. Ideally, a straight line is preferable. The width b of the vertical light-shielding portion, which is called in actual commercial transactions, is the distance between the ridges of the amount of undulation. Therefore, by controlling the amount of undulation to be 0.05 mm or less, preferably 0.03 mm or less, the vertical light-shielding It is preferable to use a high-precision tape cassette that does not leak light in the section 4.

As shown in FIG. 3, in relation to the hard side light emitting portion B and the light receiving portion B ₁ of the tape cassette, when the cassette tape passes through the prism A, the detection light for detecting the tape end is prevented from passing. The vertical light-shielding portion and the splicing tape formed with the transparent portion that transmits the detection light pass through the prism light outlet, but the width dimension b is larger than the width dimension a of the prism A that reflects the light from the hard side light emitting portion. Since light can be completely blocked by the vertical light-shielding portion 4, malfunction of the hardware-side light-receiving portion sensor is eliminated. Further, by setting the width dimension b of the vertical light-shielding portion 4 and the width dimension c of the transparent portion 5 to be c ≦ b, the light amount of the transparent portion 5 is reduced and the vertical light-shielding portion 4 is formed.
It is preferable to increase the light-shielding property of _{No. 1} and prevent malfunction of the sensor of the light-receiving unit B ₁ on the hard side.

In the example of FIGS. 4 and 5, at least one vertical light-shielding portion 4 for blocking the transmission of the detection light for detecting the tape end is provided in the attachment portion 10 of the splicing tape 3 with the leader tape 2, and the detection portion. Using a cassette tape provided with an identification means formed with a transparent portion 5 for transmitting light,
And the notch 6 into which the light source A on the hard side is inserted, and the notch 6
In a tape cassette 11 provided with a light passage hole 7 provided on the side wall of the cassette facing the light source B on the hard side inserted in the vertical direction, a vertical light-shielding portion with respect to the width e of the substantial light passage hole excluding the prism light outlet. The width dimension b of 4 is e ≦ b,
The malfunction of the sensor of the hardware side light receiving portion B ₁ can be surely prevented.

Further, in a tape cassette such as an 8 mm video cassette or a digital video cassette in which the prism A is not provided, the width dimension b of the vertical light shielding portion 4 is larger than the width dimension e of the light passage hole 7. By making them equal or larger, it is possible to prevent malfunction of the hardware side light receiving unit sensor.

In any case, the light is prevented from leaking from the vertical light-shielding portion 4 of the splicing tape 3 as the tape end detection means, and the usage identification means is always accurately identified to ensure the reliability of the usage identification means. Improve the sex
Even in a tape cassette in which a prism is not used in the tape cassette, it is possible to eliminate the malfunction of the hardware side light receiving unit sensor by the same dimension setting.

[0013]

According to the present invention, the width dimension a of the prism for reflecting the light from the hard side light emitting portion and the width dimension b of the vertical light shielding portion are provided.
By setting a to b, it is possible to completely block the light when the vertical light-shielding portion passes through the prism light outlet, and the malfunction of the hardware side light-receiving sensor is eliminated. Further, by setting the width dimension b of the vertical light-shielding portion and the width dimension c of the transparent portion to be c ≦ b, the light amount of the transparent portion is reduced and the light-shielding property of the vertical light-shielding portion is increased so that the hardware side light-receiving portion sensor malfunctions. In addition to the above, there is another method for detecting the tape end, in which a light source is inserted into the cutout portion of the tape cassette and light is detected from the light passage hole on the side wall of the cassette. On the other hand, by setting the width dimension b of the vertical light-shielding portion to be e ≦ b, it is possible to prevent malfunction of the hardware side light-receiving portion sensor, and in any case, surely block the transmission of the detection light and identify the application without error. Therefore, there is an effect that accurate detection is always possible, reliability is remarkably improved, and commercial value is increased.

[Brief description of the drawings]

FIG. 1 is a tape detection part showing an embodiment of the present invention, (a)
Is a front view, (b) is an enlarged sectional plan view, and (c) is an enlarged explanatory view of a vertical light-shielding portion.

FIG. 2 shows the use state of FIG. 1, (a) is an enlarged front view, and (b) is a perspective view thereof.

FIG. 3 is a plan view showing a state in which the cassette of the example of FIG. 1 is used.

FIG. 4 is a plan view showing a usage state of another embodiment of the present invention.

5 is a partially enlarged side view taken along line AA of FIG.
Shows when the front lid is open.

[Explanation of symbols]

A prism B light emitting part B ₁ light receiving part a prism width dimension b vertical light shielding part width dimension c transparent part width dimension e light passing hole width dimension f vertical light shielding part edge waviness 1 magnetic tape 2 leader tape 3 splicing tape 4 Vertical light-shielding part 5 Transparent part 6 Notch part 7 Light passage hole 10 Laminating part

Claims (4)

[Claims] 1. A cassette tape in which an end portion of a tape for recording a magnetic signal is connected to a transparent leader tape through a splicing tape, and at least 1 is provided at a portion where the splicing tape is attached to the leader tape.
In a tape cassette equipped with an identification means having a vertical light-shielding portion for blocking the transmission of the detection light for detecting the two tape ends and a transparent portion for transmitting the detection light, the light from the light emitting portion on the hardware side is reflected. A tape cassette characterized in that the width dimension of the vertical light-shielding portion is greater than or equal to the width dimension of the prism. 2. A cassette tape in which an end portion of a tape for recording a magnetic signal is connected to a transparent leader tape via a splicing tape, and at least 1 is provided at a portion where the splicing tape is attached to the leader tape.
In a tape cassette provided with an identification means having a vertical light-shielding portion for blocking transmission of detection light for detecting two tape ends and a transparent portion for transmitting detection light, a width dimension of the vertical light-shielding portion is transparent. A tape cassette characterized by being made larger or equal to the width of the part. 3. The vertical light-shielding portion is formed by printing, and the waviness amount of both end edges of the vertical light-shielding portion is 0.0.
The tape cassette according to claim 2, which is 5 mm or less. 4. A cassette tape in which an end portion of a tape for recording a magnetic signal is connected to a transparent leader tape via a splicing tape, and at least 1 is provided at a portion where the splicing tape is attached to the leader tape.
A vertical light-shielding portion for blocking detection light transmission for two tape end detections, and an identification means formed with a transparent portion for transmitting detection light, and a cutout portion for inserting a light source on the hardware side and the cutout portion. In a tape cassette provided with a light passage hole on the side wall of the cassette facing the inserted light source on the hard side, the width dimension of the vertical light-shielding portion is larger than or equal to the width dimension of the light passage hole. Tape cassette to do.