GB2215702A - Glass tape guide - Google Patents
Glass tape guide Download PDFInfo
- Publication number
- GB2215702A GB2215702A GB8828843A GB8828843A GB2215702A GB 2215702 A GB2215702 A GB 2215702A GB 8828843 A GB8828843 A GB 8828843A GB 8828843 A GB8828843 A GB 8828843A GB 2215702 A GB2215702 A GB 2215702A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tape
- tape guide
- guide
- present
- cassette
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000011521 glass Substances 0.000 title claims abstract description 11
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 3
- 239000005388 borosilicate glass Substances 0.000 claims description 3
- 229960002050 hydrofluoric acid Drugs 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 12
- 229920003023 plastic Polymers 0.000 abstract description 7
- 239000004033 plastic Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000003068 static effect Effects 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 230000009183 running Effects 0.000 description 8
- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08757—Guiding means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/605—Guiding record carrier without displacing the guiding means
Landscapes
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Storage Of Web-Like Or Filamentary Materials (AREA)
Abstract
A tape guide for tape cassettes is disclosed, for which a glass with a hardness of 6.0 to 7.5 on the Mohs scale is used as the material, whereas metal or a plastic material is used in the prior art. The device of the present invention thus shows lower surface roughness, prevents generation of static electric charges, and makes damage to the tape less likely. Further the device of the present invention saves manufacturing costs because the manufacturing process is simpler.
Description
TAPE CHIDE
The present invention relates to a tape guide, in particular a tape guide for a video tape cassette, the taPe guide being especially improved.
In tape cassettes, such as video tape cassettes, tape guides have the function of guiding the tape, wound between two reels, so that the magnetic tape is maintained in its correct position even though the diameter of the rolls of tape wound on each reel may vary widely. Tape guides generally prevent vibration and damage to the magnetic tape.
Tape guides in video tape cassettes of the prior art are primarily made of stainless steel named SUS 316. This material causes an increase in the manufacturing cost of the tape cassette, and also causes aggravation or roughening of the surface of the tape guide, surface damage and generation of static electric charges on the surface of the tape guide, resulting in a deterioration of the display quality.
In order to overcome such disadvantages, the use of a plastic material has been proposed, but the use of this material caused an increase in the surface roughness of the tape guide. Consequently, the running of the tape showed undesirable features, and the phenomenon of drop out (intermittent omission of information in the display) was frequently encountered.
Thus according to one aspect of the present invention, there is provided a tape guide for a tape cassette, for example a video tape cassette, adapted to guide the tape between the reels of the cassette, and being made of a glass having a hardness of between 6.0 and 7.5 on the Mohs scale.
According to a further aspect of the present invention there is provided a tape cassette comprising a tape guide as hereinbefore described.
To overcome the above-mentioned disadvantages of tape cassettes of the prior art, the present invention proposes the use of glass having a hardness of between 6.0 and 7.5 on the Mohs scale as the material of the tape guide. (en a glass material is used, the manufacturing process becomes simple, surface roughness is improved, and the generation of static electric charges is kept to a minimum, thereby preventing damage to the tape which is very sensitive to magnetism.
The glass material proposed for the present invention is preferably a borosilicate glass, preferably in the form of a tube, and preferably having its inner and outer surfaces treated with fluoric acid (HF) in order to smooth its sharp edges and to provide opacity to the glass tube. Such opacity improves the external appearance and the surface roughness.
The advantages of the present invention will be more thoroughly illustrated by the following examples relating to a preferred embodiment of the present invention with reference to the accompanying drawings in which
Figure 1 is a plane view of the lower half member of a video tape cassette;
Figure 2 is a graph showinq the surface roughness of a tape guide constructed according to the present invention;
Figure 3 is a graph showing the surface roughness of a tape guide made of stainless steel according to the prior art; and
Figure 4 is a graph showing the surface roughness of a tape guide made of plastics material according to the prior art.
Referring to Fiqure 1, tape guides 5, 6 have the function of guiding the tape 8 which is wound between a supply reel 1 and winding reel 2, so that the tape should maintain the correct position even if the diameter of the wound rolls of the tape is varied greatlv.The tape is wound from the supply reel 1 to the winding reel 2, being guided by a guide pin 3, a flap 4, tape guides 5, 6, and a guide roller 7. The tape guides 5, 6 prevent vibrations and damage which are liable to occur to the tape.
Example 1
A borosilicate glass tube having a hardness of 7 on the Mohs scale was cut, and the cut surface was processed to make it smooth, while the inner surface of the glass tube was treated with fluoric acid (HF). Then the surface roughness was measured using a surface roughness guage manufactured by
Rank Taylor Hobson Company, and the result of the measurement is shown in Figure 2.
Comparative Example 1
A SUS 316 stainless steel tube was cut and ground to make the cut portion smooth, and the surface roughness of the tape guide thus made was measured and is shown in Figure 3.
Comparative Example 2
The surface roughness of a tape guide made of plastic material (acetal copolymer) was measured, and the result is shown in Figure 4.
The tape guide according to the present invention an embodiment of which is described in Example 1, showed a surface roughness of less than 0.01 micrometre, while the tape guide made of SUS 316 stainless steel showed a surface roughness of 0.5 to 1 micrometry (Comparative Example 1), and the tape guide made of the plastic material showed a surface roughness of 0.5 to 1.6 micrometres (Comparative Example 2).
The drop-out phenomenon for the cases of the different examples was measured by repeatedly running a video tape using tape guides made of the materials of Example 1 and Comparative examples 1 and 2 and the drop-out stabilities obtained thereform are comparatively shown in Table 1 below. (Number of specimens N: 50, 5 s/20 dB).
Table 1
Comparative Comparative
Running Example 1 Example 1 Example 2 (Present Invention) (SUS 316) (Plastic) 1 round(s) 12 12 13 50 " 15 18 20 100 " 16 20 21
In carrying out the drop-out test, after repeated runnings of the tape by the above-indicated number of rounds, the drop-out test was performed through the middle portion of the tape where the influence of external factors was minimized. Further, by checking the time of the repeated running of the tape (FF/Rew time (sec), BR-6400 JVC used), the results were obtained as shown in Table 2 below.
Table 2
Comparative Comparative
Running Example 1 Example 1 Example 2 (Present Invention) (SUS 316! (Plastic) 1 round(s! 2'21/2'32 2'20/2'33 2'25/2'34 50 " 2'16/2'33 2'18/2'36 2'17/2'35 100 " 2'16/2'31 2'17/2'33 2'18/2'37
It is seen that the result of the running test for the device of the present invention is almost the same level as that of Comparative Example 1.
As can be seen above, the surface roughness of the device according to the present invention is far superior when compared with Comparative
Examples 1 and 2, and therefore, there is no possibility of damage and generation of static electric charges during the running of the tape if the device of the present invention is used. There is not only a prevention of damage, but also a lowering of the manufacturing cost of the tape cassette when the present invention is used, because the manufacturing process for the cassette is very simple.
Claims (10)
1. A tape guide for a tape cassette, adapted to guide the tape between the reels of the cassette, and being made of a glass having a hardness of between 6.0 and 7.5 on the Mohs scale.
2. A tape guide as claimed in claim 1 being for a video tape cassette.
3. A tape guide as claimed in claim 1 or claim 2 wherein said glass is a borosilicate glass.
4. A tape guide as claimed in any one of claims 1 to 3 being in the form of a tube.
5. A tape guide as claimed in claim 4, wherein the inner or outer surface of said tube is treated with fluoric acid.
6. A video cassette magnetic tape guide made of a glass having a hardness between 6.0 and 7.5 on the Mohs scale.
7. A tape guide as claimed in claim 1 substantially as herein described.
8. A tape guide as claimed in claim 1 substantially as herein described with reference to Example 1.
9. A tape cassette comprising a tape guide as claimed in any one of the preceding claims.
10. A tape cassette as claimed in claim 9 being a video tape cassette.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019880002784A KR910001214B1 (en) | 1988-03-16 | 1988-03-16 | Tape guide for video cassette |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8828843D0 GB8828843D0 (en) | 1989-01-18 |
| GB2215702A true GB2215702A (en) | 1989-09-27 |
Family
ID=19272864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8828843A Withdrawn GB2215702A (en) | 1988-03-16 | 1988-12-09 | Glass tape guide |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH01248381A (en) |
| KR (1) | KR910001214B1 (en) |
| GB (1) | GB2215702A (en) |
-
1988
- 1988-03-16 KR KR1019880002784A patent/KR910001214B1/en not_active IP Right Cessation
- 1988-09-16 JP JP63232162A patent/JPH01248381A/en active Pending
- 1988-12-09 GB GB8828843A patent/GB2215702A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| KR890015263A (en) | 1989-10-28 |
| GB8828843D0 (en) | 1989-01-18 |
| JPH01248381A (en) | 1989-10-03 |
| KR910001214B1 (en) | 1991-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |