KR19990020310U - VRT tape end and reel rotation detection device - Google Patents

Abstract

The present invention relates to a tape end detection and reel rotation detection device for detecting the start and end of the V-Cal and at the same time detecting the reel rotation, the first refractive portion for irradiating light through the optical path (L) of the tape A first prism 60 composed of a 62 and a second refractive portion 64 for irradiating light toward the supply reel 40 and the take-up reel 50; A tape detecting light receiving sensor (72) (74) for detecting light emitted from the first refractive portion (62) from both sides of the tape cassette and passing through the optical path (L); A second prism 90 fixed to the main base 1 and refracting and reflecting light emitted from the second refraction portion 64 along a predetermined path; Each of the supply reel 40 and the take-up reel 40 are integrally formed with the opening and closing member 44 composed of the opening portion 44a and the blocking portion 44b so as to periodically pass the light irradiated from the second refractive portion 64, respectively. 50); It is provided to the main PC ratio (80) below the main base (1) consists of a reel detection light receiving sensor (72) (74) for detecting the light that is refracted by the second prism (90). The present invention has a simple structure to detect the end of the tape as well as to detect the rotational state of the reel as well as to have an effect of improving the assembly by reducing the number of parts.

Description

VRT tape end and reel rotation detection device

The present invention relates to a V seed, and more particularly to a tape end detection and reel rotation detection device for detecting the start and end of the V-al and at the same time detect the rotation of the reel.

In general, BC-RA is a device for recording an image signal on a tape or reproducing the recorded signal by rotating the video head to the tape in the process of moving the tape along a predetermined path. The configuration of the present invention is schematically illustrated. The reel 20 and the take-up reel 30 are provided on the main base 1. A vertical post 2 and a supply side guide post 3 for guiding the tape drawn out from the supply reel 20 are provided. In addition, a tension forol (4) is provided to pressurize the tape to impart a tension between the vertical post (2) and the supply side guide post (3) during tape travel. In addition, one side of the supply-side guide post 3 is provided with a full-width erasing head 5 which contacts the tape and erases the recorded contents of the tape. Then, the supply side guide roller 6a and supply side inclined pole 6b, which are tape-loaded by the supply side pole base 6, and the winding side guide roller 7a, which is tape-loaded by the winding-side pole base 7, A winding side inclined pole 7b is provided, and a video head is provided between the supplying side pole base 6 and the winding side pole base 7 in contact with the tape to record a signal on the tape or to read the recorded signal. A head drum assembly 8 is provided.

In addition, an audio / control head 9 is provided which contacts the tape passing through the winding-side guide roller 7b and scans the audio signal and the control signal. And the capstan shaft 11a which rotates by the power of the winding-up guide post 10 and the capstan motor 11, and cooperates with the pinch roller 12 and provides the driving force of a tape is provided.

The V-CAL detects a state in which the tape on either side of the supply reel 20 and the take-up reel 30 are released to prevent the tape from being applied to the tape and to prevent the tape from being damaged. There is a need for an end sensing device for sensing. To this end, conventionally, as shown in FIGS. 1 and 2, a light emitting diode 82 is provided on a main PC 80 positioned below the main base 1, and the light emitting diode 82 is provided on the main base 1. The prism 13 for guiding the light of) to the top and dispersing it to both sides is installed. And both sides of the main base (1), in detail, when the tape cassette is seated on the main base (1), the light receiving sensors (14a) (14b) for detecting the light scattered from the prism is located on both sides of the tape cassette Is installed. In addition, in the tape cassette C, a receiving groove H into which the prism 13 is inserted, and light scattered from the prism 13 to both sides of the receiving groove H reach the light receiving sensors 14a and 14b. The optical path L is configured to allow. The optical path L formed in the tape cassette C is in a state blocked by the tape T. As shown in FIG.

Each of the tapes T is provided with transparent portions allowing light transmission at both ends. Therefore, the light emitted from the light emitting diode 82 is irradiated to the light receiving sensors 14a and 14b through the optical path, and the light is transmitted to the light receiving sensors 14a and 14b while the recording surface of the tape is blocking the path. On the other hand, if all the tape is released from the reel on either side, since the transparent portion configured at the tape end is located in the path, the light of the light emitting diode 82 passes through the transparent portion and reaches the corresponding light receiving sensor. Accordingly, the corresponding reel senses that the tape T is consumed, that is, the release is almost completed, stops the mode in progress, and proceeds to the next input mode to prevent the tape from being damaged.

In addition, the V-Cal is provided with a reel rotation sensing device for detecting whether the reel is rotating at an appropriate speed according to the conveyance of the tape to prevent tension adjustment and tape slowing applied to the tape. That is, the tape is moved to one side by the cooperation of the actual capstan shaft 11a and the pinch roller 12, at which time one reel unwinds the tape and the other winds the tape. Therefore, if the reel of the tape is rapidly rotated, the tension of the tape is generated more than necessary, resulting in poor image quality. On the contrary, if the rotation speed is slow, the tape does not wind up, causing the sag of the tape, and further, the traveling system. The tapes were tangled with each other, causing the tape to be damaged.

Accordingly, as shown in FIG. 2, a sensing sensor 15, 16 having light emitting parts 15a, 16a and light receiving parts 15b, 16b is provided at the lower end of the supply reel 20 and the take-up reel 30. On the bottom of each supply reel 20 and take-up reel 30, annular cut-off portions 41a and 51a are inserted between the light emitting portions 15a and 16a and the light receiving portions 15b and 16b. Each of the blocking portions 41a and 51a is provided with a plurality of communicating portions 41b and 51b for periodically passing light emitted from the light emitting portions 15a and 16a, respectively, to open portions 41b ( The control unit determines the parallax that the light passing through 51b is detected by the light receiving units 15b and 16b to detect the rotational speed of the reel.

However, the conventional V-C has a complicated configuration because the tape end detection device and the reel rotation detection device must be separately provided as described above, and in particular, the reel rotation detection device has separate light emitting parts 15a and 16a. And sensor sensors 15 and 16 having light receiving portions 15b and 16b, respectively, are provided, which not only increases manufacturing costs but also degrades assemblability.

Accordingly, the present invention has been made in view of the above-described point, and an object thereof is to provide a tape end and reel rotation detection device of V-CAL capable of detecting end detection and reel rotation of the tape as a simple structure.

1 is a plan view schematically showing a tape end and a reel rotation detection device of a conventional V-Cal;

Figure 2 is a cross-sectional view showing the configuration of the tape-end end and the reel rotation detection device of the conventional V-AL

Figure 3 is a plan view schematically showing a tape end and reel rotation detection device of the V-Cal according to the present invention

Figure 4 is a perspective view showing the configuration of the first prism of the tape end and the reel rotation detection device of the V-Cal according to the present invention

5 is a cross-sectional view showing the configuration of the V-RL reel rotation detection device according to the present invention

♣ Explanation of symbols for the main parts of the drawing ♣

1: main base 40: supply reel

50: reel 60: first prism

62: first refractive portion 64: second refractive portion

80: main PC ratio 82: light emitting diode

90: second prism 92a: first reflecting unit

92b: second reflective part 94a: third reflective part

100: light receiving sensor for reel paper C: tape cassette

L: Light path H: Receiving groove

T: Tape

The object of the present invention is to be fixed to the main base, the first refractive portion is inserted into the receiving groove for irradiating light through the optical path, and the agent for irradiating light toward the supply reel and winding reel from the lower part of the main base A first prism having two refractive portions; A light-receiving sensor for detecting a light emitted from the first refraction portion at both sides of the tape cassette to sense light passing through the optical path; A second prism fixed to the main base and refracting and reflecting light emitted from the second refractive portion along a predetermined path; A supply reel and a take-up reel, each of which has an opening and closing member composed of an opening part and a blocking part so as to periodically pass the light radiated from the second refraction part; It can be achieved by the tape end detection and reel rotation detection device of the V-C is made of a reel detection light receiving sensor provided on the main PC ratio of the lower part of the main base to detect the light reflected by the second prism.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the tape cassette end detection device according to the present invention will be described in more detail as follows. (The same configuration as in the prior art is omitted, and the reference numerals are the same. Explain.)

3 and 4 are plan views showing a schematic configuration of the tape end and reel rotation sensing apparatus according to the present invention, according to the light emitting diode to the main PC (80) provided in the lower portion of the main base (1) 82 is provided, and a first prism 60 is provided on the main base 1 between the supply reel 40 and the take-up reel 50 to guide the light of the light emitting diode upward and to disperse it to both sides. . In addition, the main PC emergency protrudes on both sides of the main base 1 (in detail, the tape cassette C is adjacent to both sides of the tape cassette when the tape cassette C is seated on the main base 1). Tape-receiving light receiving sensors 72 and 74 for sensing the light to be dispersed are respectively installed. In addition, the tape cassette C includes a receiving groove H into which the first prism 60 is inserted, and light dispersed from the prism 60 to both sides of the receiving groove H to the light receiving sensors 72 and 74. The optical path L is configured to allow to reach. The end part of this optical path L is in the state blocked by the tape T. As shown in FIG.

In addition, a second prism 90 for reflecting a predetermined path of light emitted from the first prism 60 is provided at the main base 1 at the lower part of the supply reel 40 and the take-up reel 50. The lower portion of the main PC ratio 80 is provided with a reel detection light receiving sensor 100, 102 for detecting the light reflected by the refraction in the second prism 90.

4 is a perspective view showing the configuration of the first prism 60 according to the present invention, which receives light generated from the light emitting diodes 82 and irradiates the light with the tape sensing light receiving sensors 72 and 74. The first refraction portion 62 and the second refraction portion 64 for refracting and irradiating light with the second prism 90.

The first refractive portion 62 is positioned on the main base 1 and irradiates light to the tape sensing light sensors 72 and 74 through an optical path L formed on the tape cassette C. The second refraction portion 64 is located on the bottom surface of the main base 1 to irradiate light to the second prism 90 positioned below the supply reel 40 and the take-up reel 50.

In addition, the second prism 90 has a lower end disposed below the main base 1 so as to receive light from the second refraction portion 64 of the first prism 60 and reflect the upper portion to reflect upwardly. A first refraction piece 92 having a second reflection portion 92b reflecting light reflected from the first reflection portion 92a in a horizontal state at an upper end thereof; 92b), a second refracting piece 94 having a third reflecting portion 94a for refracting and reflecting the refracted light downward. The first refractive piece 92 and the second refractive piece 94 are integrally formed by the connecting piece 96.

On the other hand, under each of the supply reel 40 and the winding reel 50, the opening 44a to allow or block the light emitted from the second reflecting portion 92b to reach the third reflecting portion 94a. An annular opening and closing member (44) (54) in which the (52a) and the blocking portions (44b) and (54b) are alternately arranged is integrally formed. The opening and closing members 44 and 54 are configured to be integral with each reel 40 and 50 and rotate together with the reel and are configured to periodically pass light.

According to the present invention having the above configuration, the light emitted from the light emitting diode 82 is received through the first refractive portion 62 and the second refractive portion 64 of the prism 60, respectively. 74 and the second prism 90. The light irradiated from the first first refraction portion 62 is irradiated through the path L of the tape cassette C. In this case, the recording surface of the tape T which blocks the light blocks the path L. Light does not reach the light receiving sensors 72 and 74, while on the other hand, when the tape T is consumed from one of the reels, the transparent part configured at the end of the tape is positioned at the end of the optical path. ) Light passes through the transparent part and reaches the corresponding light receiving sensor for tape detection. Therefore, it detects that the tape consumption on the reel is completed to stop the mode in progress to prevent damage to the tape.

In addition, the light irradiated from the second refractive portion 64 of the first prism 60 is irradiated toward the first reflective portion 92a of the second prism 90 and refracted by the first reflective portion 92a. Light is refracted in the horizontal direction at the second reflecting portion 92b and irradiated to the third reflecting portion 94a side. At this time, the rotating opening and closing members 44 and 54 pass the light from the opening portions 44a and 54a to the third reflecting portion 94a, and block the light from the blocking portions 44b and 54b to prevent the second prism. Periodically electrical on / off signal is generated by the reel sensing light receiving sensor 100, 102 provided on the main PC ratio 80 at the lower end of the second refractive piece 94 of 90. Therefore, the controller determines the rotation state of the reel based on the generation period of the on / off signal of the reel detection light receiving sensor 100.

As described above, the VRS tape end detection and reel rotation detection device of the present invention includes a first refraction portion for irradiating light generated from one light emitting diode toward an optical path formed on a tape cassette, and a supply reel. And a first prism provided at a lower end of the winding reel side and having a second refractive portion irradiating light with a second prism that refracts and reflects light along a predetermined path, and is integrally formed with the reel in the excavation path of the second prism. By installing an opening and closing member having an opening and a blocking part, the end structure of the tape can be sensed as well as the reel rotation state can be sensed as well as the assembly can be improved by reducing the number of parts.

Claims (3)

It is fixed to the main base 1, the first refractive portion 62 is inserted into the receiving groove for irradiating light through the optical path (L), the supply reel 40 and the lower portion of the main base (1) and A first prism 60 having a pair of second refractive portions 64 for irradiating light toward the winding reel 50; A tape detecting light receiving sensor (72) (74) for detecting light emitted from the first refractive portion (62) from both sides of the tape cassette and passing through the optical path (L); A second prism 90 fixed to the main base 1 and refracting and reflecting light emitted from the second refractive portion 64 of the first prism 60 along a predetermined path; Each of the opening and closing members 44 and 54, which are disposed on the refraction path of the second prism 90 and consists of the openings 44a and 54a and the blocking sections 44b and 54b so as to periodically pass the light, is integrated. Supply reel 40 and the winding reel (50) consisting of; The tape end detection and reel of the V-C is made of a reel detection light receiving sensor 100, 102 provided on the main PC ratio 80 under the main base 1 to detect the light reflected by the second prism 90. Rotation sensing device. According to claim 1, wherein the second prism 90 has a lower end is disposed below the main base (1) refracted reflection of the light irradiated from the second refractive portion 64 of the first prism 60 to the top The first refraction piece having a first reflecting portion 92a and a second reflecting portion 92b reflecting light reflected from the first reflecting portion 92a in the horizontal direction from the upper portion of the first reflecting portion 92a. 92; A second refraction piece (94) having a third reflection portion (94a) refractively reflecting the light refracted by the second reflection portion (92b) to a reel detection light receiving sensor (100) located below; The first refraction piece (92) and the second refraction piece (94); connecting piece 96 to connect integrally; the tape end detection and reel rotation detection device of the V-C. The method of claim 2, wherein the opening and closing member (44, 54) is installed between the second reflecting portion (92b) and the third reflecting portion (94a) of the second prism 90, the light periodically passes through the rotation Tape end detection and reel rotation detection device of V-Cal.