JP2006071325A - Lens meter - Google Patents

Lens meter Download PDF

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JP2006071325A
JP2006071325A JP2004252164A JP2004252164A JP2006071325A JP 2006071325 A JP2006071325 A JP 2006071325A JP 2004252164 A JP2004252164 A JP 2004252164A JP 2004252164 A JP2004252164 A JP 2004252164A JP 2006071325 A JP2006071325 A JP 2006071325A
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Prior art keywords
green led
power supply
lens
operating voltage
voltage
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Japanese (ja)
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Masateru Kunii
正輝 國井
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Topcon Corp
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Topcon Corp
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Priority to JP2004252164A priority Critical patent/JP2006071325A/en
Priority to CNB2005100937636A priority patent/CN100442039C/en
Priority to KR1020050080130A priority patent/KR100741360B1/en
Publication of JP2006071325A publication Critical patent/JP2006071325A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0228—Testing optical properties by measuring refractive power
    • G01M11/0235—Testing optical properties by measuring refractive power by measuring multiple properties of lenses, automatic lens meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0207—Details of measuring devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G01N2021/9583—Lenses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens meter of a simple constitution in which current value of a current passing through a green LED does not greatly vary even if an operating voltage of the green LED varies. <P>SOLUTION: The lens meter comprises the green LED 13 for irradiating a test lens L with measuring luminous flux; a power supply circuit SC for supplying electric power for the green LED 13; a light receiving element (CCD11) for receiving the measuring luminous flux transmitted through the test lens L; and an arithmetic and control circuit 24 for computing refraction characteristics of the test lens L on the basis of output of the light receiving element (CCD11). The electric power has a first voltage value set greater than the operating voltage of the green LED 13. The power supply circuit SC has a resistor R for setting the first voltage value at a second voltage value, the operating voltage of the green LED 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、緑色のＬＥＤを測定光束に用いたレンズメータに関するものである。   The present invention relates to a lens meter using a green LED as a measurement light beam.

従来のレンズメータとしては、測定光束を被検レンズに対して投影する光源として緑色ＬＥＤを用いたオートレンズメータが知られている（例えば特許文献１参照）。   As a conventional lens meter, an auto lens meter using a green LED as a light source for projecting a measurement light beam onto a test lens is known (see, for example, Patent Document 1).

この緑色ＬＥＤとしては、例えば４Ｖの動作電圧で動作するように設計されているものもある。この場合、５Ｖの電源からの電圧を抵抗を介して４Ｖに降下させ、この降下させた４Ｖの電圧を緑色ＬＥＤに印加して、緑色ＬＥＤを発光させるようにしている。   Some of these green LEDs are designed to operate at an operating voltage of 4V, for example. In this case, the voltage from the 5V power source is lowered to 4V through a resistor, and the lowered 4V voltage is applied to the green LED to cause the green LED to emit light.

ところで、緑色ＬＥＤの動作電圧は、実際には製品バラツキによって例えば略３．５〜４Ｖの範囲の値となっている。このため、動作電圧が４Ｖで設計された回路に製品バラツキによる実際の動作電圧が３．５Ｖ〜４Ｖの緑色ＬＥＤを配線接続した場合、動作電圧が３．５Ｖと４Ｖでは緑色ＬＥＤの内部を流れる電流の電流値に大きな差が生じるものであった。
特開平１１−３２６１２５号公報参照 By the way, the operating voltage of the green LED actually has a value in the range of about 3.5 to 4 V, for example, due to product variations. For this reason, when a green LED having an actual operating voltage of 3.5V to 4V due to product variation is connected to a circuit designed with an operating voltage of 4V, the green LED flows in the operating voltage of 3.5V and 4V. There was a large difference in the current value of the current.
See JP-A-11-326125

しかしながら、緑色ＬＥＤでは、内部を流れる電流の電流値が変化すると、発光する光の波長が変化するため、緑色ＬＥＤ内を流れる電流の電流値が動作電圧のバラツキによって大きく異なるのは好ましいものではなかった。   However, in the green LED, when the current value of the current flowing through the inside changes, the wavelength of the emitted light changes. Therefore, it is not preferable that the current value of the current flowing through the green LED varies greatly depending on variations in operating voltage. It was.

そこで、本発明は、緑色ＬＥＤに動作電圧のバラツキがあっても、簡単な構成で緑色ＬＥＤ内を流れる電流の電流値が大きく異なることのないレンズメータを提供することを目的とするものである。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens meter in which the current value of the current flowing through the green LED does not vary greatly with a simple configuration even if the operating voltage varies among the green LEDs. .

この目的を達成するため、この発明は、被検レンズに測定光束を照射する緑色ＬＥＤと、前記緑色ＬＥＤに電源を供給する電源供給回路と、前記被検レンズを透過した測定光束を受光する受光素子と、前記受光素子の出力に基づいて前記被検レンズの屈折特性を演算する演算制御回路とを有し、前記電源は前記緑色ＬＥＤの動作電圧より大きく設定された第１電圧値を有すると共に、前記電源供給回路は前記第１電圧値を前記緑色ＬＥＤの動作電圧である第２電圧値に設定するための抵抗を有するレンズメータとしたことを特徴とする。   In order to achieve this object, the present invention provides a green LED for irradiating a test lens with a measurement light beam, a power supply circuit for supplying power to the green LED, and a light reception for receiving the measurement light beam transmitted through the test lens. And a calculation control circuit for calculating a refraction characteristic of the test lens based on an output of the light receiving element, and the power source has a first voltage value set larger than an operating voltage of the green LED. The power supply circuit is a lens meter having a resistor for setting the first voltage value to a second voltage value that is an operating voltage of the green LED.

この構成によれば、緑色ＬＥＤに動作電圧のバラツキがあっても、簡単な構成で緑色ＬＥＤ内を流れる電流の電流値が大きく変化するのを防止できる。   According to this configuration, even if the operating voltage varies among the green LEDs, it is possible to prevent the current value of the current flowing through the green LEDs from changing greatly with a simple configuration.

以下、この発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１において、１はレンズメータの本体ケース、２は本体ケース１の正面上部に設けられた表示装置（表示手段）としての液晶表示器、３は本体ケース１の正面の上下方向の中間部に突設された上筐体部、４は本体ケース１の正面の下部に突設された下筐体部、５は下筐体部３上に設けられた円錐筒状で且つ頂部が裁断されたレンズ受である。このレンズ受５上にはメガネＭの被検レンズＬが載置される。   In FIG. 1, 1 is a lens meter main body case, 2 is a liquid crystal display as a display device (display means) provided on the front upper part of the main body case 1, and 3 is an intermediate portion in the vertical direction on the front of the main body case 1. The projecting upper housing part 4 is a lower housing part projecting from the lower front part of the main body case 1, and 5 is a conical cylinder provided on the lower housing part 3, and the top part is cut. It is a lens receiver. A lens L to be examined of the glasses M is placed on the lens receiver 5.

また、上筐体部２内には、図２に示したように測定光束をレンズ受５上の被検レンズＬに投影する投影光学系１０が設けられている。さらに、下筐体部３内には、エリアセンサである二次元のＣＣＤ（受光素子）１１と、被検レンズを透過する測定光束をＣＣＤ１１に導く受光光学系１２が設けられている。尚、投影光学系１０と受光光学系１２は被検レンズの屈折特性を測定する測定光学系Ｓを構成している。   Further, as shown in FIG. 2, a projection optical system 10 that projects the measurement light beam onto the lens L to be tested on the lens receiver 5 is provided in the upper housing portion 2. Furthermore, a two-dimensional CCD (light receiving element) 11 that is an area sensor and a light receiving optical system 12 that guides a measurement light beam that passes through the lens to be tested to the CCD 11 are provided in the lower housing portion 3. The projection optical system 10 and the light receiving optical system 12 constitute a measurement optical system S that measures the refractive characteristics of the lens to be examined.

この投影光学系１０は、光源である緑色ＬＥＤ１３，ピンホール１４ａが設けられたピンホール板１４及びコリメータレンズ１５をこの順に有する。また、受光光学系１２は、ハルトマンプレート等のパターン板１６，スクリーン１７及び結像レンズ１８を有する。   The projection optical system 10 includes a green LED 13 as a light source, a pinhole plate 14 provided with a pinhole 14a, and a collimator lens 15 in this order. The light receiving optical system 12 includes a pattern plate 16 such as a Hartmann plate, a screen 17, and an imaging lens 18.

更に、図２のＣＣＤ１１は図３に示したＣＣＤ駆動回路１９により駆動制御されるようになっている。しかも、ＣＣＤ駆動回路１９には、配線２０を介して電源回路２１から１８Ｖの電圧が供給されるようになっている。   Further, the CCD 11 of FIG. 2 is driven and controlled by the CCD drive circuit 19 shown in FIG. In addition, a voltage of 18 V is supplied from the power supply circuit 21 to the CCD drive circuit 19 via the wiring 20.

また、電源回路（電源）２１から緑色ＬＥＤ１３には電源供給回路ＳＣを有する。この電源供給回路ＳＣは、配線２０に一端が接続された配線２０ａと、配線２０ａに一端が接続された抵抗Ｒと、この抵抗Ｒの他端に一端が接続された配線２２を有する。そして、この配線２２の他端には緑色ＬＥＤ１３のアノード側が接続されている。この緑色ＬＥＤ１３のカソード側はアースされている。尚、抵抗Ｒは抵抗値が６９８Ωに設定されている。   Further, the green LED 13 from the power supply circuit (power supply) 21 has a power supply circuit SC. The power supply circuit SC includes a wiring 20a having one end connected to the wiring 20, a resistor R having one end connected to the wiring 20a, and a wiring 22 having one end connected to the other end of the resistor R. The anode side of the green LED 13 is connected to the other end of the wiring 22. The cathode side of the green LED 13 is grounded. The resistance value of the resistor R is set to 698Ω.

この緑色ＬＥＤ１３はスイッチング素子２３によりＯＮ・ＯＦＦされるようになっている。尚、スイッチング素子２３は、コレクタＣが配線２２に接続され、エミッタＥがアースされ、ベースＢが演算制御回路２４に接続されている。この演算制御回路２４は、ＣＣＤ駆動回路１９を制御するようになっている。   The green LED 13 is turned ON / OFF by a switching element 23. In the switching element 23, the collector C is connected to the wiring 22, the emitter E is grounded, and the base B is connected to the arithmetic control circuit 24. The arithmetic control circuit 24 controls the CCD drive circuit 19.

次に、このような構成のレンズメータの作用を説明する。   Next, the operation of the lens meter having such a configuration will be described.

このような構成においては、演算制御回路２４がスイッチング素子２３のベースに動作電圧を印加すると、スイッチング素子２３がＯＮして、緑色ＬＥＤ１３がＯＦＦする。   In such a configuration, when the arithmetic control circuit 24 applies an operating voltage to the base of the switching element 23, the switching element 23 is turned on and the green LED 13 is turned off.

また、演算制御回路２４がスイッチング素子２３のベースへの動作電圧の印加をＯＦＦすると、スイッチング素子２３がＯＦＦして、緑色ＬＥＤ１３がＯＮし、緑色ＬＥＤ１３から緑色の測定光束が出射される。この測定光束は、図１のピンホール板１４のピンホール１４ａを介してコリメータレンズ１５に導かれて、このコリメータレンズ１５により平行光束とされ、被検レンズＬに投影される。   When the operation control circuit 24 turns off the application of the operating voltage to the base of the switching element 23, the switching element 23 is turned off, the green LED 13 is turned on, and the green measurement light beam is emitted from the green LED 13. The measurement light beam is guided to the collimator lens 15 through the pinhole 14a of the pinhole plate 14 in FIG. 1, and is converted into a parallel light beam by the collimator lens 15 and projected onto the lens L to be measured.

一方、被検レンズＬを透過した測定光束は、パターン板１６のパターンをスクリーン１７に投影する。このスクリーン１７に投影されたパターンは結像レンズ１８によりＣＣＤ１１に結像される。このＣＣＤ１１に結像されたパターン像はＣＣＤ駆動回路１９によりパターン像信号として取り出されて、このパターン像信号は演算制御回路２４に入力される。この演算制御回路２４は、入力されるパターン像信号から被検レンズＬの屈折特性を求めて、この求めた屈折特性を液晶表示器２に表示させる。   On the other hand, the measurement light beam transmitted through the test lens L projects the pattern of the pattern plate 16 onto the screen 17. The pattern projected on the screen 17 is imaged on the CCD 11 by the imaging lens 18. The pattern image formed on the CCD 11 is taken out as a pattern image signal by the CCD drive circuit 19, and this pattern image signal is input to the arithmetic control circuit 24. The arithmetic control circuit 24 obtains the refraction characteristic of the lens L to be detected from the input pattern image signal, and displays the obtained refraction characteristic on the liquid crystal display 2.

ところで、上述した緑色ＬＥＤ１３の動作電圧は個体差によって３．５〜４Ｖの範囲でバラツキがある。このような緑色ＬＥＤ１３を例えば５Ｖの電源で発光させたときに、緑色ＬＥＤ１３の動作電圧のバラツキが３．５〜４．０の範囲では、緑色ＬＥＤ１３内を流れる電流の電流値に略±１０ｍＡの変動が生じ、緑色ＬＥＤ１３から出射する光の波長が略±６ｎｍ程度変動する。また、緑色ＬＥＤ１３から出射する光の光量は、緑色ＬＥＤ１３内を流れる電流が２０ｍＡのときに１００％とすると、緑色ＬＥＤ１３内を流れる電流の電流値に略±１０ｍＡの変動が生じた場合、６０〜１４０％程度変動する。   By the way, the operating voltage of the green LED 13 described above varies in the range of 3.5 to 4 V due to individual differences. When such a green LED 13 is caused to emit light by a power source of 5 V, for example, when the variation in the operating voltage of the green LED 13 is in the range of 3.5 to 4.0, the current value of the current flowing in the green LED 13 is approximately ± 10 mA. Variation occurs, and the wavelength of light emitted from the green LED 13 varies by approximately ± 6 nm. Further, if the amount of light emitted from the green LED 13 is 100% when the current flowing through the green LED 13 is 20 mA, when the current value of the current flowing through the green LED 13 varies by approximately ± 10 mA, 60 to It fluctuates about 140%.

この点、上述したように緑色ＬＥＤ１３の電源としてＣＣＤ駆動回路１９の１８Ｖの電源回路２１を用いた場合、緑色ＬＥＤ１３の動作電圧のバラツキが３．５〜４．０の範囲では、緑色ＬＥＤ１３内を流れる電流の電流値に略±０．１ｍＡの変動しか生ぜず、緑色ＬＥＤ１３から出射する光の波長及び光量が殆ど変動しなかった。   In this regard, as described above, when the 18 V power supply circuit 21 of the CCD drive circuit 19 is used as the power supply for the green LED 13, the green LED 13 is within the range of 3.5 to 4.0 variation in the operating voltage of the green LED 13. Only a change of about ± 0.1 mA occurred in the current value of the flowing current, and the wavelength and light amount of the light emitted from the green LED 13 hardly changed.

このように緑色ＬＥＤ１３の動作電圧３．５〜４Ｖの数倍である１８Ｖの電圧の電源を緑色ＬＥＤ１３の電源として用いると共に、この１８Ｖの電源の電圧を抵抗Ｒで緑色ＬＥＤ１３の動作電圧３．５〜４Ｖに対応する電圧に降下させて緑色ＬＥＤ１３に印加するようにした場合には、緑色ＬＥＤ１３の動作電圧３．５〜４Ｖに近い電圧５Ｖの電源を用いた場合に比べて、緑色ＬＥＤ１３内を流れる電流の変動を±１０ｍＡから±０．１ｍＡまで１／１００程度減少させることができた。この結果、緑色ＬＥＤ１３内を流れる電流の変動が殆ど生じなくなった。   In this way, a power supply with a voltage of 18 V, which is several times the operating voltage 3.5 to 4 V of the green LED 13, is used as the power supply of the green LED 13, and the operating voltage of the green LED 13 is 3.5 with the resistor R. When the voltage is lowered to a voltage corresponding to ˜4 V and applied to the green LED 13, the inside of the green LED 13 is compared with the case where a power supply of a voltage 5 V close to the operating voltage 3.5 to 4 V of the green LED 13 is used. The fluctuation of the flowing current could be reduced by about 1/100 from ± 10 mA to ± 0.1 mA. As a result, the current flowing through the green LED 13 hardly fluctuates.

尚、以上説明した実施例では緑色ＬＥＤ１３の動作電圧として４Ｖのものを用い、この緑色ＬＥＤ１３の電源として１８Ｖの電源を用いたが、必ずしもこれらの数値に限定されるものではない。要は、緑色ＬＥＤ１３の動作電圧のバラツキがあっても、緑色ＬＥＤ１３内を流れる電流の変動が殆ど生じなくなるような電源電圧を設定できれば、上述した数値に限定されるものではない。換言すれば、緑色ＬＥＤ１３の動作電圧のバラツキがあっても、緑色ＬＥＤ１３から発光される光の波長の変動を殆ど生じなくなるような電源電圧を設定できれば、緑色ＬＥＤ１３の電源の電圧は上述した数値に限定されるものではない。   In the embodiment described above, the operating voltage of the green LED 13 is 4 V, and the power source of the green LED 13 is 18 V. However, the present invention is not necessarily limited to these values. In short, even if there is a variation in the operating voltage of the green LED 13, the value is not limited to the above value as long as the power supply voltage can be set so that the fluctuation of the current flowing in the green LED 13 hardly occurs. In other words, even if there is a variation in the operating voltage of the green LED 13, if the power supply voltage can be set so that the wavelength of the light emitted from the green LED 13 hardly fluctuates, the power supply voltage of the green LED 13 is set to the above-described numerical value. It is not limited.

以上説明したように、この発明の実施の形態のレンズメータは、被検レンズＬに測定光束を照射する緑色ＬＥＤ１３と、前記緑色ＬＥＤ１３に電源（電源回路２１）を供給する電源供給回路ＳＣと、前記被検レンズＬを透過した測定光束を受光する受光素子（ＣＣＤ１１）と、前記受光素子（ＣＣＤ１１）の出力に基づいて前記被検レンズＬの屈折特性を演算する演算制御回路２４を有する。しかも、前記電源（電源回路２１）は前記緑色ＬＥＤ１３の動作電圧より大きく設定された第１電圧値を有する。また、前記電源供給回路ＳＣは前記第１電圧値を前記緑色ＬＥＤ１３の動作電圧である第２電圧値に設定するための抵抗Ｒを有する。   As described above, the lens meter according to the embodiment of the present invention includes the green LED 13 that irradiates the lens L to be measured with the measurement light beam, the power supply circuit SC that supplies the green LED 13 with a power supply (power supply circuit 21), A light receiving element (CCD11) that receives the measurement light beam that has passed through the test lens L, and an arithmetic control circuit 24 that calculates the refractive characteristics of the test lens L based on the output of the light receiving element (CCD11). In addition, the power supply (power supply circuit 21) has a first voltage value set larger than the operating voltage of the green LED 13. The power supply circuit SC includes a resistor R for setting the first voltage value to a second voltage value that is an operating voltage of the green LED 13.

この構成によれば、緑色ＬＥＤ１３に動作電圧のバラツキがあっても、緑色ＬＥＤ１３内を流れる電流の電流値が大きく変化するのを防止して、緑色ＬＥＤ１３から出射する光の波長及び光量が殆ど変動しないようにできる。   According to this configuration, even if there is a variation in the operating voltage of the green LED 13, the current value of the current flowing in the green LED 13 is prevented from changing greatly, and the wavelength and light amount of the light emitted from the green LED 13 are almost fluctuated. You can avoid it.

また、緑色ＬＥＤ１３に電源を供給する回路に電力のバラツキがあっても、同様に緑色ＬＥＤ１３から出射される光の波長のバラツキを防ぐことができる。   Further, even if there is a variation in power in the circuit that supplies power to the green LED 13, variation in the wavelength of light emitted from the green LED 13 can be similarly prevented.

また、この発明の実施の形態のレンズメータにおいて、前記電源供給回路ＳＣを介して前記緑色ＬＥＤ１３に供給される電願は前記受光素子（ＣＣＤ１１）に用いられる受光素子用電源（電源回路２１）となっている。   Further, in the lens meter according to the embodiment of the present invention, the electric power supplied to the green LED 13 via the power supply circuit SC is a light receiving element power supply (power supply circuit 21) used for the light receiving element (CCD 11). It has become.

この構成によれば、緑色ＬＥＤ１３の電源として前記受光素子（ＣＣＤ１１）の受光素子用電源（電源回路２１）を用いているので、緑色ＬＥＤ１３専用の電源を別途設ける必要がない。   According to this configuration, since the light receiving element power supply (power supply circuit 21) of the light receiving element (CCD 11) is used as the power supply of the green LED 13, it is not necessary to separately provide a power supply dedicated to the green LED 13.

更に、この発明の実施の形態のレンズメータにおいて、前記電源（電源回路２１）は前記第１電圧値が前記緑色ＬＥＤ１３の動作電圧の数倍に設定されている。   Furthermore, in the lens meter according to the embodiment of the present invention, the power source (power circuit 21) has the first voltage value set to several times the operating voltage of the green LED 13.

このように前記電源（電源回路２１）を前記第１電圧値が前記緑色ＬＥＤ１３の動作電圧の数倍に設定することにより、簡単な構成で緑色ＬＥＤ１３内を流れる電流の電流値が大きく変化するのを防止できる。   Thus, by setting the power supply (power supply circuit 21) so that the first voltage value is several times the operating voltage of the green LED 13, the current value of the current flowing through the green LED 13 is greatly changed with a simple configuration. Can be prevented.

この発明に係るレンズメータの一例を示す概略斜視図である。It is a schematic perspective view which shows an example of the lens meter which concerns on this invention. 図１のレンズメータの光学系を示す説明図である。It is explanatory drawing which shows the optical system of the lens meter of FIG. 図２の緑色ＬＥＤの制御回路図である。FIG. 3 is a control circuit diagram of the green LED in FIG. 2.

符号の説明Explanation of symbols

１１…ＣＣＤ（受光素子）
１３…緑色ＬＥＤ
２１…電源回路（電源）
２４…演算制御回路
Ｌ…被検レンズ
Ｒ…抵抗（電源供給回路の一部）
ＳＣ…電源供給回路
11 ... CCD (light receiving element)
13 ... Green LED
21 ... Power supply circuit (power supply)
24 ... arithmetic control circuit L ... test lens R ... resistance (part of power supply circuit)
SC ... Power supply circuit

Claims (3)

被検レンズに測定光束を照射する緑色ＬＥＤと、
前記緑色ＬＥＤに電源を供給する電源供給回路と、
前記被検レンズを透過した測定光束を受光する受光素子と、
前記受光素子の出力に基づいて前記被検レンズの屈折特性を演算する演算制御回路とを有し、
前記電源は前記緑色ＬＥＤの動作電圧より大きく設定された第１電圧値を有すると共に、前記電源供給回路は前記第１電圧値を前記緑色ＬＥＤの動作電圧である第２電圧値に設定するための抵抗を有することを特徴とするレンズメータ。 A green LED that irradiates the test lens with a measurement beam;
A power supply circuit for supplying power to the green LED;
A light receiving element for receiving a measurement light beam transmitted through the test lens;
An arithmetic control circuit that calculates the refractive characteristics of the lens to be examined based on the output of the light receiving element;
The power source has a first voltage value set larger than the operating voltage of the green LED, and the power supply circuit sets the first voltage value to a second voltage value that is the operating voltage of the green LED. A lens meter having a resistance. 前記電源供給回路を介して前記緑色ＬＥＤに供給される電源は前記受光素子に用いられる受光素子用電源であることを特徴とする請求項１に記載のレンズメータ。   The lens meter according to claim 1, wherein the power supplied to the green LED through the power supply circuit is a light receiving element power source used for the light receiving element. 前記電源は前記第１電圧値が前記緑色ＬＥＤの動作電圧の数倍に設定されていることを特徴とする請求項１又は２に記載のレンズメータ。   3. The lens meter according to claim 1, wherein the power supply has the first voltage value set to several times the operating voltage of the green LED.
JP2004252164A 2004-08-31 2004-08-31 Lens meter Pending JP2006071325A (en)

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CNB2005100937636A CN100442039C (en) 2004-08-31 2005-08-29 Lens meter
KR1020050080130A KR100741360B1 (en) 2004-08-31 2005-08-30 Lensmeter

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