JPH02193348A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPH02193348A JPH02193348A JP1012201A JP1220189A JPH02193348A JP H02193348 A JPH02193348 A JP H02193348A JP 1012201 A JP1012201 A JP 1012201A JP 1220189 A JP1220189 A JP 1220189A JP H02193348 A JPH02193348 A JP H02193348A
- Authority
- JP
- Japan
- Prior art keywords
- tape
- light
- receiving element
- beginning
- hollow
- 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.)
- Pending
Links
- 230000001681 protective effect Effects 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000005530 etching Methods 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 229920005989 resin Polymers 0.000 abstract description 2
- 230000003292 diminished effect Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は発光素子と受光素子によりテープ始終端検知を
行なう磁気記録再生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus that detects the beginning and end of a tape using a light emitting element and a light receiving element.
従来の技術
磁気記録再生装置におけるテープ始終端を検知する手段
としてたとえば第４図に示すものが知られている１図面
に基づき説明すると、発光素子１からの素子光２は発光
素子１と受光素子３の間に介在するテープ４を透過し、
保護ホルダー５の突出部６の空洞を通過して受光素子３
に入射する。A known means for detecting the beginning and end of a tape in a conventional magnetic recording/reproducing apparatus is shown in FIG. It passes through the tape 4 interposed between 3,
The light receiving element 3 passes through the cavity of the protrusion 6 of the protective holder 5.
incident on .
受光素子３はリード線７を介して回路８へ接続されてい
る。そして、受光素子３に入射する透過光量の差（たと
えばテープと透明テープとの差）によってテープ始終端
の検知を行なうものである。The light receiving element 3 is connected to a circuit 8 via a lead wire 7. The beginning and end of the tape is detected based on the difference in the amount of transmitted light incident on the light receiving element 3 (for example, the difference between the tape and the transparent tape).
発明が解決しようとする課題
ところが、このような構成においては保護ホルダー５が
一般的に樹脂成形されており、表面に光沢を有するため
、発光素子１と受光素子３の光軸以外からテープ４を透
過しないで保護ホルダー５の突出部６に直接入射した外
部光９が空洞内表面１０で反射して、受光素子３に到達
する。このため、テープ始終端でないにもかかわらずテ
ープ始終端であると誤検知してしまう事態が発生する。Problems to be Solved by the Invention However, in such a configuration, the protective holder 5 is generally made of resin and has a glossy surface, so it is difficult to insert the tape 4 from a direction other than the optical axis of the light emitting element 1 and the light receiving element 3. External light 9 that directly enters the protrusion 6 of the protective holder 5 without being transmitted is reflected by the cavity inner surface 10 and reaches the light receiving element 3. For this reason, a situation may occur in which the tape is erroneously detected as being at the beginning or end of the tape even though it is not the beginning or end of the tape.
本発明はこのような課題を解決するもので、テープ始終
端であると誤検知するのを防止することを目的とするも
のである。The present invention is intended to solve such problems, and aims to prevent false detection of the beginning and end of the tape.
課題を解決するための手段
この課題を解決するために本発明は、受光素子を覆う保
護ホルダーに発光素子がら受光素子への光路となる空洞
を有する突出部を設け、前記空洞の内面に凹凸部を形成
したものである。Means for Solving the Problem In order to solve this problem, the present invention provides a protective holder that covers the light receiving element with a protrusion having a cavity that serves as an optical path from the light emitting element to the light receiving element, and has an uneven surface on the inner surface of the cavity. was formed.
作用
この構成により、保護ホルダーの突出部の空洞内面の凹
凸部で外部光が乱反射され、受光素子に達する外部光の
量は非常に少なくなり、テープ始終端の誤検知を防止す
ることができる。Effect: With this configuration, external light is diffusely reflected by the unevenness on the inner surface of the cavity of the protrusion of the protective holder, and the amount of external light reaching the light receiving element is extremely small, making it possible to prevent false detection of the beginning and end of the tape.
実施例
以下、本発明の実施例について、図面に基づいて説明す
る。Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.
まず、第１図に基づき第１実施例について説明する。First, a first embodiment will be described based on FIG.
図において、樹脂成形された保護ホルダー１１の突出部
１２の空洞１３の内端には受光素子１４が設けられ、ま
た前記空洞１３の内面は金型をエツチングすることによ
り梨地状の凹凸面１５で形成されている。In the figure, a light receiving element 14 is provided at the inner end of a cavity 13 of a protrusion 12 of a resin-molded protective holder 11, and the inner surface of the cavity 13 is formed into a satin-like uneven surface 15 by etching a mold. It is formed.
上記構成の保護ホルダー１１に受光素子１４を取り付け
、この受光素子１４に対向する発光素子（図示せず）を
設けてテープの始終端を検知するようにした場合、テー
プを透過しないで空洞１３に入射した外部光１６は空洞
１３の内面の凹凸面１５によって乱反射され、受光素子
１４に到達する外部光１６の量は非常に少なくなる。そ
の結果、従来生じていた外部光によるテープ始終端誤検
知を防止することができる。When the light-receiving element 14 is attached to the protective holder 11 having the above structure and a light-emitting element (not shown) is provided opposite to the light-receiving element 14 to detect the beginning and end of the tape, it is possible to detect the beginning and end of the tape without passing through the cavity 13. The incident external light 16 is diffusely reflected by the uneven surface 15 on the inner surface of the cavity 13, and the amount of external light 16 reaching the light receiving element 14 becomes extremely small. As a result, it is possible to prevent false detection of the beginning and end of the tape due to external light, which conventionally occurs.
次に第２図に基づき第２実施例について説明する。Next, a second embodiment will be described based on FIG.
この実施例では保護ホルダー１１の突出部１２の空洞１
３の内面に金型により雌ねじ状の溝１７を形成してあり
、テープを透過しないで空洞１３に入射した外部光１６
は溝１７によって乱反射されるものである。In this embodiment, the cavity 1 of the protrusion 12 of the protective holder 11 is
A female thread-shaped groove 17 is formed by a mold on the inner surface of the tape 3, and external light 16 that enters the cavity 13 without passing through the tape.
is diffusely reflected by the groove 17.
次に第３図に基づき第３実施例について説明する。Next, a third embodiment will be described based on FIG.
この実施例では保護ホルダー１１の突出部１２の空洞１
３の内面に金型によりローレット状の溝１８を刻設して
あり、テープを透過しないで空洞１３に入射した外部光
１６は溝１８によって乱反射されるものである。In this embodiment, the cavity 1 of the protrusion 12 of the protective holder 11 is
A knurled groove 18 is formed on the inner surface of the tape 3 by a mold, and external light 16 that enters the cavity 13 without passing through the tape is diffusely reflected by the groove 18.
以上各実施例で述べたように保護ホルダー１１の突出部
１２の空洞１３の内面に凹凸面１５あるいは溝１７゜１
８などの凹凸部を形成しであることにより、空洞１３内
で外部光１６が乱反射され、受光素子１４に到達する外
部光１６の量は非常に少なくなり、従来生じていた外部
光によるテープ始終端の誤検知を防止することができる
。As described above in each embodiment, the uneven surface 15 or the groove 17° 1 is formed on the inner surface of the cavity 13 of the protrusion 12 of the protective holder 11.
By forming uneven parts such as 8, the external light 16 is diffusely reflected within the cavity 13, and the amount of external light 16 reaching the light receiving element 14 is extremely small. Erroneous detection of edges can be prevented.
発明の効果
以上のように本発明−によれば、受光素子を覆う保護ホ
ルダーの突出部の空洞内面に凹凸部を形成するという簡
単な構成で、しかも低コストでテープ始終端誤検知を防
止できるため、磁気記録再生装置の信頼性の向上を図る
ことができる。Effects of the Invention As described above, according to the present invention, false detection of the beginning and end of the tape can be prevented at low cost with a simple configuration in which an uneven portion is formed on the inner surface of the cavity of the protruding portion of the protective holder that covers the light receiving element. Therefore, the reliability of the magnetic recording/reproducing device can be improved.
第１図は本発明の第１実施例における保護ホルダーの断
面図、第２図は本発明の第２実施例における保護ホルダ
ーの断面図、第３図は本発明の第３実施例における保護
ホルダーの断面図、第４図は従来のテープ始終端検知部
の一部切欠説明図である。
１１・・・保護ホルダー、 １２・・・突出部、１３・
・・空洞、１４・・・受光素子、１５・・・凹凸面、１
６・・・外部光、１７．１８・・・溝。
代理人 森 本 義 弘
第１
図
１１・−一保護、％Ｉレヲ一
１２・・文記部
第３
図
第４図
１８・・溝FIG. 1 is a cross-sectional view of a protective holder according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a protective holder according to a second embodiment of the present invention, and FIG. 3 is a cross-sectional view of a protective holder according to a third embodiment of the present invention. FIG. 4 is a partially cutaway explanatory view of a conventional tape start/end detecting section. 11...Protection holder, 12...Protrusion part, 13.
... Cavity, 14... Light receiving element, 15... Uneven surface, 1
6...External light, 17.18...Groove. Agent Yoshihiro Morimoto No. 1 Figure 11.-1 protection, %I record 12.. Literature Department No. 3 Figure 4 Figure 18.. Groove
Claims (1)
介在するテープ中を透過する光量の差によりテープ始終
端検知を行なう磁気記録再生装置であって、前記受光素
子を覆う保護ホルダーに前記発光素子から前記受光素子
への光路となる空洞を有する突出部を設け、前記空洞の
内面に凹凸部を形成した磁気記録再生装置。1. A magnetic recording/reproducing device in which a light-emitting element and a light-receiving element are arranged facing each other and detecting the beginning and end of a tape based on the difference in the amount of light transmitted through the tape interposed between the two, wherein the light-emitting element is attached to a protective holder that covers the light-receiving element. A magnetic recording/reproducing device comprising: a protruding portion having a cavity serving as an optical path from an element to the light receiving element; and an uneven portion formed on an inner surface of the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1012201A JPH02193348A (en) | 1989-01-20 | 1989-01-20 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1012201A JPH02193348A (en) | 1989-01-20 | 1989-01-20 | Magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02193348A true JPH02193348A (en) | 1990-07-31 |
Family
ID=11798791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1012201A Pending JPH02193348A (en) | 1989-01-20 | 1989-01-20 | Magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02193348A (en) |
-
1989
- 1989-01-20 JP JP1012201A patent/JPH02193348A/en active Pending
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