CN2148953Y - Candle digital display multi-purpose watch - Google Patents

Abstract

The utility model relates to a meter for measuring the illumination intensity for people who take photos and engage in photography, which comprises a photoelectric transducer (1), an amplifying circuit (2), an analog / digital conversion circuit (3), a digital display (4), a reference voltage circuit (5), a power supply (6), etc. The illumination intensity can be transferred into electrical signals via the photoelectric converter (1) and the illuminated candle numbers of measured points can be direct displayed via the display device (4) after amplification and quantization. The meter has the advantages of clear reading, accurate use, convenient use, etc.

Description

Candle digital display multi-purpose watch

The utility model is a kind of instrument that supplies photograph and film and tv photography personnel and optical measurement person to use as the measurement intensity of illumination, belongs to optical instrument instrument field.

So far the entrained light meter (as the SEKONLC of Japan) of image production person is pointer-type.Therefore exist reading unclear, it is high that precision is owed, shortcomings such as the inaccurate and fragile pointer of zeroing, and will enlarge measurement range by changing dim light plate (milky white plate), the hemisphere of its milky white plate and flat board are splits, thus operate very inconvenient.

The utility model is made up of photoelectric commutator photoelectric commutator, amplifying circuit, display and power supply and casing etc. the power of light is converted to the size of electric signal, amplifies through amplifying circuit again, then demonstrates the illumination candle light number of measured point by display.In order to reach clear reading, accurate, easy to use purpose, there is mould/number conversion circuit ， And to adopt digital display device so between amplifying circuit and display, be situated between, provide reference voltage by reference voltage circuit to mould/number conversion circuit.

The utility model is owing to adopt digital display mode, thus clear reading, accurate not only, and use very convenient.

Fig. 1 is a theory of constitution block diagram of the present utility model, and (1) is photoelectric commutator, and (2) are that amplifying circuit (3) is mould/number conversion circuit, and (4) are digital display device, and (5) are reference voltage circuit, and (6) are power supply.

Fig. 2 is an embodiment electrical schematic diagram of the present utility model.

In order to make this instrument more reliable and more stable, thus adopt that dark current is little, the photoresponse range of linearity is wide, with the corresponding to silicon PN junction of luminosity function photodiode D ₁As photoelectric commutator 1.The electric signal of photoelectric commutator 1 output is through amplifying circuit A ₁After the amplification, give by impact damper A ₂, integrator A ₃With comparer A ₄In form mould/number conversion circuit 3, the simulating signal of input is quantified as digital signal.In order to improve the stability of instrument, so accuracy is by clamp diode D ₂Stabilivolt DW ₂, operational amplifier A ₅, fet T ₃With barretter CRD ₂Provide reference voltage Deng the high stability reference voltage circuit of forming 5 to mould/number conversion circuit 3.The output number of mould/number conversion circuit 3 is given digital display device 4.Digital display device 4 by oscillator (by phase inverter F ₁And F ₂Constitute), frequency divider IC ₂, IC ₄, counter IC ₅IC ₆, IC ₇, IC ₈, latch IC ₉, code translator IC ₁₀, IC ₁₁, IC ₁₂, driver IC ₁₃, IC ₁₄, IC ₁₅, IC ₁₆And compositions such as display screen LCD and logic control circuit, its essence is a digital D.C. voltmeter, do not give unnecessary details so do not add.Demonstrate the illumination candle light number of corresponding measured point by display screen LCD.For range extension and the low-voltage Presentation Function is provided, in display 4, added by biconditional gate IC ₁₇And feed resistance R ₁₂, R ₁₃, R ₁₄And R ₁₇Low pressure display circuit 4-1 and the multiplying power K switch formed ₂As power supply E ₁Cross when hanging down IC ₁₇Send high level, the low pressure character " ← " on the display screen is lighted, need to change power supply E with prompting ₁In the time will measuring high light, the multiplying power K switch ₂Close, at this moment prompting character "+" is lighted.In order to save power supply, easy to use, its power circuit 6 has adopted by direct supply E ₁And E ₂, fet T ₁, transmission gate IC ₁, the start button K switch ₁With time circuit R ₁, C ₁Deng the power supply automatic shutdown circuitry of forming.Work as K ₁During connection, E ₂Negative voltage make T ₁End, power supply is normal; Work as K ₁During disconnection, C ₁Pass through R ₁Discharge, after the regular hour (about 1 minute), T ₁Conducting makes transmission gate IC ₁End, then power and cut off automatically.

Fig. 3 is a shell structure synoptic diagram of the present utility model.Housing is made with the highstrenghtpiston, and the first half is the light-receiving head, and Lower Half is the operation display box, and both fuse by connecting link 33, and the light-receiving head can connecting link 33 be 180 ° of axle right-hand rotations, turns left 90 °.The sphere that receives the milky white plate 32 that light uses partly and flat part part be incorporate, And and can about stir.31 is the multiplying power K switch ₂, 35 are the data manipulation dish, and 34 is display screen, and 36 are the zeroing window, and 37 is the start button K switch ₁, 38 is battery case etc.

In use, first rotation time data disks e places the light sensitivity numerical value of used film indicating window C Nei ， And that milky white plate 32 is moved to right to the shading state, presses the start button K switch then ₁Power-on is adjusted potentiometer W by the zeroing window, make display screen 34 zero setting after, can measure.At this moment place the milky white plate 32 of this table measured point ， And that milky white plate 32 is moved to left to light transmission state, at this moment just can on display screen, read the illumination candle light number of measured point.According to this reading, rotate aperture data disks a again, the candle light value that records is placed under " ▽ " symbol d, so just can obtain various data splittings between shutter speed b and the aperture F/T data disks a by data disks 35, select for use for the cameraman.Unclamp the start button K switch ₁, after then maintaining the original state about one minute, i.e. automatically cutting off power source.When surveying, with the multiplying power K switch than the low light level ₂Place " X1 " shelves when surveying high light, with K ₂Place " X10 " shelves.

Claims (6)

1, a kind ofly forms by photoelectric commutator, amplifying circuit, display and power supply and housing, the power of light is converted to the size of electric signal by photoelectric commutator, amplify through amplifying circuit again, then demonstrate the Candlepower digital display multi-function meter of the illumination candle light number of measured point by display, it is characterized in that between amplifying circuit (2) and display (4), being situated between mould/number conversion circuit (3) is arranged, display (4) is that digital De ， And provides reference voltage by reference voltage circuit (5) to mould/number conversion circuit (3).

2, by the described Candlepower digital display multi-function meter of claim 1, it is characterized in that photoelectric commutator (1) is and the corresponding to silicon PN junction of luminosity function photodiode.

3, by claim 1 or 2 described Candlepower digital display multi-function meters, it is characterized in that reference voltage circuit (5) is by clamp diode (D ₂), stabilivolt (DW ₂), operational amplifier (A ₅), fet (T ₃) and barretter (CRD ₂) waiting composition, power supply is through stabilivolt (DW ₂) voltage stabilizing, clamp diode (D ₂) and resistance (R ₇, R ₈) give operational amplifier (A after the dividing potential drop ₅), operational amplifier (A ₅) output terminal and fet (T ₃) grid join, by fet (T ₃) drain electrode (B) provide reference voltage for mould/number conversion circuit (3).

4, by the described Candlepower digital display multi-function meter of claim 1, it is characterized in that in display (4), having added by biconditional gate (Ic ₁₇) and feed resistance (R ₁₂, R ₁₃, R ₁₄, R ₁₁) the low pressure display circuit (4-1) and the multiplying power switch (K that form ₂), biconditional gate (Ic ₁₇) output terminal link to each other with the respective symbols of display screen.

5, by claim 1 or 2 described Candlepower digital display multi-function meters, it is characterized in that power circuit (6) is by direct supply (E ₁And E ₂), fet (T ₁), transmission gate (Ic ₁), start button switch (K ₁) and time circuit (R ₁, C ₁) wait the power supply automatic shutdown circuitry of composition, (E ₁) and (E ₂) mutually the serial connection (middle ground) after, through K ₁Be added in T ₁Grid and the drain electrode between, (R ₁) and (C ₁) And is connected between grid and the source electrode, (T ₁) drain electrode and transmission gate (Ic ₁) input end link to each other transmission gate (Ic ₁) output terminal and the feeder ear of interlock circuit join.

6, by the described Candlepower digital display multi-function meter of claim 1, it is characterized in that its housing makes with the highstrenghtpiston, its milky white plate (32) that receives that light uses be incorporate ， And and can about stir, multiplying power switch (K also is housed on housing ₂).

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