CN207502055U - Optical devices - Google Patents

Abstract

The utility model provides a kind of Optical devices for having simple in structure, small power consumption and the moisture condensation prevention unit for light-transmitting member of safety.Have housing (1), the optical filter (3) (light-transmitting member), the heater being configured near optical filter (3) and the power supply to heating installation power supply that are installed on housing (1), the heater of heater is made of positive characteristic thermistor resistance element (9).Positive characteristic thermistor resistance element (9) mould-forming is in the inside of resin seal positive temperature coefficient thermis (8).

Description

Optical devices

Technical field

The utility model is related to have the Optical devices of light-transmitting member, more specifically, be related to simple in structure, power consumption compared with Small, safety and the Optical devices for having moisture condensation prevention unit for light-transmitting member.

Background technology

In the Optical devices for having the light-transmitting members such as lens, optical filter, optics cover board, even if in order in cold Use will not condense on light-transmitting member in environment, so as to need that moisture condensation prevention unit is set to light-transmitting member.

Patent document 1 (Japanese Patent Laid-Open 2012-39193 bulletins) is disclosed is provided with moisture condensation to light-transmitting member The Optical devices (dome-type camera) of prevention unit.Fig. 9 shows Optical devices 1000 disclosed in patent document 1.

Optical devices (dome-type camera) 1000 have lens section 101, the hemisphere cover board 102 for covering lens section 101.Light It learns device 1000 and has the fan 103 for generating air stream and the air conduit 104 in the direction for changing air stream.Also, in light It learns in device 1000, the heater 105 heated to the air stream that fan 103 generates is provided in the front of fan 103.

In Optical devices 1000, the air stream generated using heater 105 to fan 103 is heated, after making heating Air stream is recycled in the inside of Optical devices 1000, so as to which the inner surface for preventing the i.e. hemisphere cover board 102 of light-transmitting member is tied Dew.

Existing technical literature

Patent document

Patent document 1：Japanese Patent Laid-Open 2012-39193 bulletins

Utility model content

Utility model technical problem to be solved

Optical devices 1000 disclosed in patent document 1 employ complicated structure to make the air stream after heating in optics The inside cycle of device 1000, is condensed, therefore there are following problems with the inner surface for preventing hemisphere cover plate 102：Equipment is big Type, component number become more, manufacture becomes complicated, and cost increases.

In addition, in Optical devices 1000, since the entire internal air of Optical devices 1000 being made to warm, there are power consumptions The problem of larger and to find moisture condensation prevent effect until need to take a long time the problem of.

In Optical devices 1000, if not setting any safety device to heater 105, when malfunctioning, having can It can lead to abnormal overheat, play cigarette, catch fire.

Technical scheme applied to solve the technical problem

The Optical devices of the utility model are completed to solve above-mentioned existing issue, as its means, this practicality Novel Optical devices include housing, be installed on housing light-transmitting member, be configured near light-transmitting member heater, To the power supply of heating installation power supply, the heater of heater is made of positive characteristic thermistor resistance element.

Light-transmitting member is, for example, lens, optical filter or optics cover board.The Optical devices of the utility model are using just Performance thermistor element heats the light-transmitting members such as lens, optical filter, optics cover board, to prevent light-transmitting member from producing Raw moisture condensation.In addition, optics cover board refers to make the component that light penetrates, and non-selection specific wavelength and the component that passes it through.

The preferred mould-forming of positive characteristic thermistor resistance element is in sealing resin.In this case, due to positive characteristic temperature-sensitive electricity The moisture-proof of resistance element improves, therefore, even if under high humidity conditions, can also use Optical devices safely.

Preferably positive characteristic thermistor resistance element is installed on rectangular flexible cable, and flexible cable is equipped with just The back side of the part of performance thermistor element is installed on housing by heat conductivity double faced adhesive tape or thermal conductive adhesive. In this case, can will be by the heat transfer that positive temperature coefficient thermis generates to housing with smaller thermal losses.Furthermore it is possible to easily Positive characteristic thermistor resistance element is installed on housing by ground.In addition, heat conductivity double faced adhesive tape is compared with general double faced adhesive tape The double faced adhesive tape being made by the higher material of heat conductivity.Thermal conductive adhesive refers to be added to improve heat transfer Bonding agent after the substance of property.

It is preferred that housing is made of metal.In this case, can be made with smaller thermal losses by positive characteristic thermistor resistance element The heat of generation is conducted via the housing that the higher metal of pyroconductivity is formed to light-transmitting member, so as to the knot of light-transmitting member Dew prevents effect to be improved.Also, it is relatively low since the set temperature of positive temperature coefficient thermis can be set to, it can Reduce power consumption.In addition, positive characteristic thermistor resistance element prevents the time of effect from shortening from starting to generate heat to finding to condense.

The negative-characteristic thermistor element that is preferably also equipped with being configured near positive temperature coefficient thermis and based on negative The temperature of performance thermistor element, the control electricity controlled the electric power that positive characteristic thermistor resistance element is applied to by power supply Road.In this case, safely and reliably it can prevent light-transmitting member from condensing with low-power consumption.

Control circuit for example has switch element, comparator element and multiple resistive elements, makes positive temperature coefficient thermis Temperature fever of the element near predetermined set temperature or set temperature, switch element are inserted into power supply and positive characteristic Between thermistor element, the on and off of comparator element control switch element, negative-characteristic thermistor element configuration exists It is first with close and positive temperature coefficient thermis with positive characteristic thermistor resistance element thermal coupling near positive characteristic thermistor resistance element The identical temperature of part, and with the resistance value under set temperature as threshold resistance value, negative-characteristic thermistor element and at least One resistance components in series connection, and certain voltage is applied with, temperature detection bleeder circuit is formed, uses and divides from temperature detection The negative-characteristic thermistor element of volt circuit and the tie point output temperature detection voltage of resistive element, at least two resistance member Part is connected in series with, and is applied with certain voltage, and formation is compared with bleeder circuit, from the resistance member compared with bleeder circuit With voltage compared with the tie point output of part and another resistive element, the resistive element of temperature detection bleeder circuit and compare use The respective resistance value of resistive element of bleeder circuit and be respectively applied to temperature detection branch pressure voltage and compare with partial pressure electricity The voltage on road is set so that the temperature in negative-characteristic thermistor element is set temperature, negative-characteristic thermistor element When resistance value is threshold resistance value, temperature detection voltage=compare voltage, in the temperature ratio of negative-characteristic thermistor element When set temperature is low, the resistance value of negative-characteristic thermistor element is higher than threshold resistance value, temperature detection voltage ＞ ratios Compared with voltage, the temperature of negative-characteristic thermistor element is higher than set temperature, resistance value of negative-characteristic thermistor element Hour than threshold resistance value, temperature detection voltage ＜ compares with voltage, alternatively, in the temperature of negative-characteristic thermistor element When lower than set temperature, negative-characteristic thermistor element resistance value is bigger than threshold resistance value, temperature detection voltage ＜ Compare with voltage, the temperature of negative-characteristic thermistor element is higher than set temperature, resistance of negative-characteristic thermistor element Value hour than threshold resistance value, temperature detection voltage ＞ compare with voltage, comparator element comparison temperature detection voltage With compare with voltage, the temperature of negative-characteristic thermistor element is lower than set temperature, electricity of negative-characteristic thermistor element When resistance value ratio threshold resistance value wants big, switch element can be set as being connected, set in the temperature ratio of negative-characteristic thermistor element Constant temperature degree is high, the resistance value of negative-characteristic thermistor element hour than threshold resistance value, can be set as switch element to cut Only.According to above-mentioned control circuit, safely and reliably it can prevent light-transmitting member from condensing with low-power consumption.

The preferred mould-forming of negative-characteristic thermistor element is in sealing resin.In this case, due to negative characteristic temperature-sensitive electricity The moisture-proof of resistance element improves, therefore, even if under high humidity conditions, can also use Optical devices safely.Alternatively, it is also possible to By positive characteristic thermistor resistance element and negative-characteristic thermistor element mould-forming in same sealing resin.It in this case, can Positive characteristic thermistor resistance element and negative-characteristic thermistor element are compactly combined into one, it is possible to reduce be installed on housing Deng installation space.In addition, the degree of the thermal coupling of positive characteristic thermistor resistance element and negative-characteristic thermistor element improves, energy It is enough to act control circuit with higher precision.In addition, the manufacture of Optical devices becomes easy.

Utility model effect

In the Optical devices of the utility model, the air of enclosure interior will not be heated on the whole, and utilize positive characteristic Thermistor element carries out local heating to light-transmitting member, thus prevents the moisture condensation of light-transmitting member, therefore power consumption is smaller.

In addition, in the Optical devices of the utility model, the use positive characteristic temperature-sensitive that resistance value rises if temperature rise electricity Heater of the resistance element as heater, therefore, even if unexpected malfunctioned, temperature will not be risen to more than certain, So as to lead to abnormal overheat, cigarette, catch fire.

In addition, the Optical devices of the utility model by positive characteristic thermistor resistance element only by being mounted on the light such as housing Through part near component, prevent from light-transmitting member and generate moisture condensation, therefore manufacture easily.

In addition, in the Optical devices of the utility model, use positive spy of temperature rise in a short time if electric power is provided Property heater of the thermistor element as heater, therefore, from moisture condensation prevention unit is started to finding that moisture condensation prevents effect Time is shorter.

Description of the drawings

Fig. 1 is the sectional view of the Optical devices 100 of embodiment 1.

Fig. 2 (A)~(C) represents to be used in the resin seal positive temperature coefficient thermis 8 of Optical devices 100, Fig. 2 (A) respectively It is the stereogram observed from top surface side, Fig. 2 (B) is the perspective elevation observed from top surface side, and Fig. 2 (C) is from bottom surface side The stereogram observed.

Fig. 3 is point for representing to be used in the resin seal positive temperature coefficient thermis 8 of Optical devices 100 and flexible cable 12 Solve stereogram.

Fig. 4 (A) is the sectional view of the Optical devices 200 of embodiment 2.Fig. 4 (B) is also the sectional view of Optical devices 200, The X-X parts of Fig. 4 (A) are shown.

Fig. 5 is the sectional view of the Optical devices 300 of embodiment 3.

Fig. 6 (A), Fig. 6 (B) represent to be used in the resin seal composite thermistor 18 of Optical devices 300, Fig. 6 (A) respectively It is the vertical view that perspective inside obtains, Fig. 6 (B) is the stereogram observed from bottom surface side.

Fig. 7 is the equivalent circuit diagram that the moisture condensation of Optical devices 300 prevents involved part.

Fig. 8 is the equivalent circuit diagram that the moisture condensation of the Optical devices 400 of embodiment 4 prevents involved part.

Fig. 9 is the stereogram for representing the Optical devices 1000 recorded in patent document 1.Optical devices shown partially in Fig. 9 1000 section.

Specific embodiment

Hereinafter, the embodiment of the utility model is illustrated with reference to attached drawing.

In addition, the embodiment of each exemplified the utility model of embodiment, the utility model is not by embodiment Content is limited.The content that different embodiments are recorded can combine implementation, and implementation content in this case is also contained in this practicality In novel.Attached drawing is intended to help to understand embodiment, may not carry out stringent drafting sometimes.For example, the composition drawn The ratio of element to the size between inscape is inconsistent with the ratio of their size described in specification sometimes.Explanation Inscape recorded in book is omitted in the accompanying drawings sometimes, is omitted number sometimes and is drawn etc..

[embodiment 1]

Fig. 1 shows the Optical devices 100 of embodiment 1.Fig. 1 is the sectional view of Optical devices 100.Fig. 2 (A)~(C) points The resin seal positive temperature coefficient thermis 8 of Optical devices 100 Biao Shi be used in, Fig. 2 (A) is the solid observed from top surface side Figure, Fig. 2 (B) is the perspective elevation observed from top surface side, and Fig. 2 (C) is the stereogram observed from bottom surface side.Fig. 3 is table Show the exploded perspective view of resin seal positive temperature coefficient thermis 8 and flexible cable 12 for being used in Optical devices 100.In addition, Resin seal positive temperature coefficient thermis 8 shown in figure is in sealing resin 11 by 9 mould-forming of positive characteristic thermistor resistance element Inside obtained from device.

Optical devices 100 are infrared ray sensors.In addition, the type of Optical devices is arbitrary, it is not limited to infrared ray biography Sensor can be the other kinds of Optical devices such as camera.

Optical devices 100 have housing 1.Housing 1 is made such as the metal as stainless steel.Housing 1 is by cylindrical shape It forms, there is top surface.Opening 2 is formed in the top surface of housing 1.

Optical filter 3 is installed in the opening 2 of housing 1 and is used as light-transmitting member.Optical filter 3 is for example by viscous Connect the inside that agent is installed on housing 1.Optical filter 3 is used to penetrate only the light of specific wavelength.In addition, in present embodiment In, using optical filter 3 as light-transmitting member, but the type of light-transmitting member is arbitrary, and can be lens, optical cover The other kinds of light-transmitting member such as plate.

Optical devices 100 have substrate 4.Substrate 4 is for example made by ceramics, resin.

Substrate 4 is equipped with pyroelectricity element 5 as optical element.

Substrate 4 is equipped with two lead terminals 6a, 6b.By plain conductor 7a, 7b, the electrode of pyroelectricity element 5 (is not schemed Show) it is connected with lead terminal 6a, 6b.In addition, in present embodiment, substrate 4 is equipped with two lead terminals 6a, 6b, but example In the case of other components such as the also built-in transistor of pyroelectricity element 5 are such as not only built-in in Optical devices 100, institute The radical of the lead terminal of installation is sometimes more than two.

The inner wall of housing 1 is equipped with resin seal positive temperature coefficient thermis 8.Details about installation condition will be under It is described in stating.

Both ends are formed with external electrode 9a, 9b by resin seal positive temperature coefficient thermis 8 such as shown in Fig. 2 (B), by welding Positive characteristic thermistor resistance element 9 be connected to terminal electrode 10a, 10b, and mould-forming is in the inside of sealing resin 11.Such as Fig. 2 (C) shown in, in resin seal positive temperature coefficient thermis 8, terminal electrode 10a, 10b expose the bottom surface of sealing resin 11.Resin Seal positive temperature coefficient thermis 8 by 9 mould-forming of positive characteristic thermistor resistance element in the inside of sealing resin 11, therefore with positive spy Property thermistor element 9 is improved compared to moisture-proof.

Resin seal positive temperature coefficient thermis 8 is installed on flexible cable 12 as shown in Figure 3.Flexible cable 12 for example by Following manner is formed, and is formed by the surface of thin rectangular downside film 12a that polyimide resin etc. is formed by copper, nickel Very thin a pair of conductors wiring 13,14 of formation is waited, and further utilizes the thin length being equally made of polyimide resin etc. Rectangular upper side thin membrane 12b is covered on conductor wiring 13,14.Wherein, one end of conductor wiring 13,14 is not by upper side thin membrane 12b is covered, and a pair of of connection disc electrode 13a, the 14a being connect with conductor wiring 13,14 are formed in the part.Then, in terminal pad Electrode 13a, 14a welding resin seal terminal electrode 10a, 10b (not shown in Fig. 3) of positive temperature coefficient thermis 8.

As shown in Figure 1, the back side for being equipped with 8 part of resin seal positive temperature coefficient thermis of flexible cable 12 passes through heat Conductibility double faced adhesive tape 15 is installed on the inner wall of housing 1.Alternatively, it is also possible to which thermal conductive adhesive is used to replace heat conductivity double Face adhesive tape 15.

The housing 1 that inner wall is equipped with resin seal positive temperature coefficient thermis 8 is installed on by bonding agent etc. and is equipped with heat and releases The substrate 4 of electric device 5.In addition, flexible cable 12 is exported to via the through hole formed between two interareas of substrate 4 The outside in space formed by substrate 4 and housing 1.

Although it is not shown, but Optical devices 100 have power supply.Power supply is used for via flexible cable 12 to positive characteristic temperature-sensitive Resistive element 9 (resin seal positive temperature coefficient thermis 8) is powered.Power supply is usually using DC power supply or battery.

In the Optical devices 100 of embodiment 1 with above structure, from power supply to positive characteristic thermistor resistance element 9 In the case of power supply, positive characteristic thermistor resistance element 9 generates heat as the heater of heater.Then, by positive characteristic temperature-sensitive electricity The heat that resistance element 9 generates is conducted to optical filter 3 via flexible cable 12, heat conductivity double faced adhesive tape 15, housing 1. In Optical devices 100, since optical filter 3 is heated by positive characteristic thermistor resistance element 9, even if in cold environment etc. It uses, optical filter 3 will not condense.

The tool of Optical devices 100 of embodiment 1 has the advantage that.

In Optical devices 100, due to will not on the whole to inside housing 1 air heat, and to optical filter 3 into Row local heating prevents the moisture condensation of optical filter 3, therefore power consumption is smaller.In addition, the positive spy of the heater as heater Property thermistor element 9 have if temperature rise resistance value rise positive resistance-temperature characteristic, if temperature excessively rises, Resistance value rises, and inhibits to generate heat, and therefore, voluntarily controls and is generated heat with constant temperature, will not generate required above heat.Cause This, the heater using positive characteristic thermistor resistance element 9 as heater also contributes to reduce power consumption.

In addition, in Optical devices 100, due to the use of the positive characteristic thermistor resistance element that resistance value rises if temperature rise 9 heater as heater, therefore be safe.That is, even if unexpected malfunctioned, due to positive characteristic thermistor resistance element 9 will not rise to certain above temperature, therefore, will not lead to abnormal overheat, play cigarette, catch fire.

In Optical devices 100, due to only by by 8 (positive characteristic thermistor resistance element of resin seal positive temperature coefficient thermis 9) being installed on part near the optical filter 3 of housing 1 just can prevent optical filter 3 from condensing, therefore manufacture and hold Easily.

[embodiment 2]

Fig. 4 (A), Fig. 4 (B) show the Optical devices 200 of embodiment 2.Fig. 4 (A) is the sectional view of Optical devices 200. Fig. 4 (B) is also the sectional view of Optical devices 200, shows the X-X parts of Fig. 4 (A).

The Optical devices 200 of embodiment 2 change the structure of the Optical devices 100 of embodiment 1.It is specific and Speech, in Optical devices 100, in the inner wall installation of housing 1, there are one (the positive characteristic temperature-sensitive electricity of resin seal positive temperature coefficient thermis 8 Resistance element 9).Optical devices 200 increase the number of resin seal positive temperature coefficient thermis 8, and four are mounted in the inner wall of housing 1 It is a.Four resin seal positive temperature coefficient thermis 8 separate the inner wall that equal interval is installed on housing 1.Optical devices 200 its His structure is set as identical with Optical devices 100.

Number of the Optical devices 200 of embodiment 2 due to increasing resin seal positive temperature coefficient thermis 8 is right Effect is prevented also to be improved compared with Optical devices 100 in the moisture condensation of optical filter 3.In addition, Optical devices 200 can Equably optical filter 3 is heated.

[embodiment 3]

Fig. 5~Fig. 7 shows the Optical devices 300 of embodiment 3.Fig. 5 is the sectional view of Optical devices 300.Fig. 6 (A), figure 6 (B) represent to be used in the resin seal composite thermistor 18 of Optical devices 300 respectively, and Fig. 6 (A) is that perspective inside obtains Vertical view, Fig. 6 (B) are the stereograms observed from bottom surface side.Fig. 7 is that the moisture condensation of Optical devices 300 prevents involved part Equivalent circuit diagram.

The Optical devices 300 of embodiment 3 change the structure of the Optical devices 100 of embodiment 1.It is specific and It says, in Optical devices 100, is equipped in housing 1 by 9 mould-forming of positive characteristic thermistor resistance element in the inside of sealing resin 11 Obtained from resin seal positive temperature coefficient thermis 8.In Optical devices 300, this is changed, as shown in figure 5, in housing 1 is mounted with resin seal composite thermistor 18.In addition, it is also increased newly not available for Optical devices 100 in Optical devices 300 Control circuit 30 shown in Fig. 7.

In Optical devices 300, the resin seal composite thermistor 18 of housing 1 is installed on such as shown in Fig. 6 (A), is by two A positive characteristic thermistor resistance element 19,29 and 39 mould-forming of negative-characteristic thermistor element are in the inside of sealing resin 21 Obtained from.Inside sealing resin 21, positive characteristic thermistor resistance element 19, negative-characteristic thermistor element 39 and positive characteristic Thermistor element 29 arranges mould-forming in the order.Positive characteristic thermistor resistance element 19,29 is provided as heater Heater.Negative-characteristic thermistor element 39 is provided as temperature sensor.Negative-characteristic thermistor element 39 is due to configuration Between positive characteristic thermistor resistance element 19,29, thus with positive characteristic thermistor resistance element 19,29 thermal couplings, follow positive characteristic The temperature change of thermistor element 19,29 makes the temperature change of oneself.

As shown in Fig. 6 (B), the bottom surface of resin seal composite thermistor 18 formed there are four terminal electrode 20a~ 20d.Terminal electrode 20a is connect with an external electrode of positive characteristic thermistor resistance element 19.Terminal electrode 20b and negative characteristic heat The external electrode connection of quick resistive element 39.An external electrical of terminal electrode 20c and positive characteristic thermistor resistance element 29 Pole connects.Terminal electrode 20d is first with another external electrode of positive characteristic thermistor resistance element 19, negative-characteristic thermistor respectively Another external electrode connection of another external electrode and positive characteristic thermistor resistance element 29 of part 39.

Resin seal composite thermistor 18 due to by positive characteristic thermistor resistance element 19,29, negative-characteristic thermistor member 39 mould-forming of part in the inside of sealing resin 21, therefore with positive characteristic thermistor resistance element 19,29, negative-characteristic thermistor member Part 39 is improved compared to moisture-proof.

Resin seal composite thermistor 18 is installed on flexible cable 22 as shown in Figure 5.In addition, though figure is not carried out Show, but be formed in flexible cable 22 for connect resin seal composite thermistor 18 terminal electrode 20a~20d company Connect disc electrode and necessary conductor wiring.Also, flexible cable 22 is equipped with resin seal composite thermistor 18 The partial back side is installed on the inner wall of housing 1 by heat conductivity double faced adhesive tape 15.

Optical devices 300 have control circuit 30 as described above.Hereinafter, with reference to Fig. 7, the moisture condensation of Optical devices 300 is prevented Only the equivalent circuit of involved part illustrates.

Optical devices 300 have power Vcc.In present embodiment, power Vcc is set as direct current 6V.SW1 is switched as electricity Source switch is connected to power Vcc.

Optical devices 300 have two 19,29 heaters as heater of positive characteristic thermistor resistance element.In addition, In the equivalent circuit diagram of Fig. 7, by positive characteristic thermistor resistance element 19 labeled as " PTC19 ", by positive characteristic thermistor resistance element 29 Labeled as " PTC29 ".As described above, positive characteristic thermistor resistance element 19,29 mould-formings are in resin seal composite thermistor The inside of 18 sealing resin 21.Positive characteristic thermistor resistance element 19,29 generates heat due to the electric power of power Vcc.

Inserted with switch element Q1 between switch SW1 and positive characteristic heat-sensitive electronic component 19,29.Switch element Q1 to from Power Vcc is switched to the power supply of positive characteristic thermistor resistance element 19,29.In present embodiment, using PNP transistor as Switch element Q1.

Control circuit 30 has resistive element R1.Resistive element R1 is connected in series with negative-characteristic thermistor element 39, structure Into temperature detection bleeder circuit.In addition, in the equivalent circuit diagram of Fig. 7, negative-characteristic thermistor element 39 is labeled as “NTC39”.As described above, negative-characteristic thermistor element 39 and positive characteristic thermistor resistance element 19,29 together mould-forming in The inside of the sealing resin 21 of resin seal composite thermistor 18.

In temperature detection bleeder circuit, the end of resistive element R1 sides is connected to the load-side (power Vcc of switch SW1 Opposite side), the end of 39 side of negative-characteristic thermistor element ground connection.Temperature detection bleeder circuit is from resistive element R1 with bearing The tie point output temperature detection voltage of performance thermistor element 39.

Control circuit 30 has the comparison bleeder circuit being connected in series by resistive element R2 and resistive element R3.Than Compared with in bleeder circuit, the end of resistive element R2 sides is connected to the load-side of switch SW1, and the end of resistive element R3 sides connects Ground.Compare and use voltage compared with being exported with bleeder circuit from resistive element R2 with the tie point of resistive element R3.

Control circuit 30 has comparator element Cmp1.

The resistive element R1 of temperature detection bleeder circuit is connected to ratio with the tie point of negative-characteristic thermistor element 39 Reversed input terminal compared with device element Cmp1-.

Compare and be connected to comparator element Cmp1's with the tie point of the resistive element R2 and resistive element R3 of bleeder circuit In-phase input terminal+.

The power supply terminal of the positive side of comparator element Cmp1 is connected to the load-side of switch SW1.

The power supply terminal ground connection of the negative side of comparator element Cmp1.

The leading-out terminal of comparator element Cmp1 is connected to the control terminal of switch element Q1 via resistive element R4.

In addition, the tie point of resistive element R4 and switch element Q1 is connected to switch SW1's additionally by resistive element R5 Load-side.

The resistance value of each element is shown in table 1.

【Table 1】

As described above, negative-characteristic thermistor element 39 is in the inside of resin seal composite thermistor 18 and positive characteristic heat Quick resistive element 19,29 thermal couplings, to approach and 19,29 identical temperature of positive characteristic thermistor resistance element.

In Optical devices 300, such as set temperature is set as 40 DEG C.Negative-characteristic thermistor element 39 has negative resistance Temperature coefficient has resistance value when set temperature is 40 DEG C as threshold resistance value.In present embodiment, as shown in table 1, make By the use of the element of the resistance value with 5.6k Ω at 40 DEG C as negative-characteristic thermistor element 39, therefore negative-characteristic thermistor is first The threshold resistance value of part 39 is 5.6k Ω.

Negative-characteristic thermistor element 39 is 40 DEG C of (temperature of positive characteristic thermistor resistance element 19,29 in the temperature of itself About 40 DEG C) when, the resistance value with the 5.6k Ω as threshold resistance value.Negative-characteristic thermistor element 39 itself When temperature is less than 40 DEG C (temperature of positive characteristic thermistor resistance element 19,29 is about 40 DEG C), have than as threshold resistance value 5.6k Ω want high resistance value.Negative-characteristic thermistor element 39 is more than 40 DEG C of (positive temperature coefficient thermis in the temperature of itself The temperature of element 19,29 is about 40 DEG C) when, there is the resistance value lower than the 5.6k Ω as threshold resistance value.

The resistive element R1 of above-mentioned temperature detection bleeder circuit, the electricity for comparing resistive element R2, R3 with bleeder circuit It resistance value and is respectively applied to temperature detection bleeder circuit and compares be set so that in negative spy with the voltage of bleeder circuit The temperature of property thermistor element 39 is 40 DEG C of set temperature, the resistance value of negative-characteristic thermistor element 39 is threshold resistance value That is during 5.6k Ω temperature detection voltage with compare it is equal (temperature detection voltage=compare with voltage) with voltage.

Specifically, as shown in table 1, resistive element R1 is set to 4.7k Ω, and resistive element R2 is set to 4.7k Ω, Resistive element R3 is set to 5.6k Ω.

As noted previously, as temperature detection bleeder circuit and comparing and being respectively connected to switch with one end of bleeder circuit The load-side of SW1, therefore in the case where power switch switchs SW1 conductings, respectively to temperature detection bleeder circuit and ratio Compared with the direct current 6V for applying power Vcc with bleeder circuit.

As a result, it is about 3.26V always to compare with voltage.

In addition, negative-characteristic thermistor element 39 temperature be set temperature 40 DEG C of (positive characteristic thermistor resistance elements 19th, 29 temperature is about 40 DEG C), the resistance value of negative-characteristic thermistor element 39 is when being i.e. 5.6 Ω of threshold resistance value, temperature inspection Survey is about 3.26V with voltage.

The temperature that table 1 is shown to compare with the calculating formula of voltage and the temperature of negative-characteristic thermistor element 39 when being 40 DEG C Spend the calculating formula of detection voltage.

When the temperature of negative-characteristic thermistor element 39 is 40 DEG C, temperature detection is about 3.26V with voltage, if but negative spy Property thermistor element 39 temperature less than 40 DEG C, then the resistance value of negative-characteristic thermistor element 39 is more than 5.6k Ω, thus Temperature detection voltage is also greater than 3.26V.

On the contrary, if the temperature of negative-characteristic thermistor element 39 is more than 40 DEG C, the electricity of negative-characteristic thermistor element 39 Resistance value ratio 5.6k Ω are small, thus temperature detection voltage is again smaller than 3.26V.

In control circuit 30, carried out using comparator element Cmp1 to comparing electricity consumption pressure and temperature detection with the size of voltage Compare, the temperature (temperature of positive characteristic thermistor resistance element 19,29) of detection negative-characteristic thermistor element 39, control switch member The on and off of part Q1.

Specifically, resistance value in negative-characteristic thermistor element 39 is bigger than threshold resistance value 5.6k Ω, temperature detection With voltage also frequently compared in the case of with voltage big (temperature detection voltage ＞ compares with voltage), it is judged as negative characteristic temperature-sensitive electricity The temperature (temperature of positive characteristic thermistor resistance element 19,29) of resistance element 39 is lower than set temperature i.e. 40 DEG C, from comparator member The maximum voltage that the leading-out terminal output of part Cmp1 is born, switch element Q1 is set as being connected, electric from power Vcc to positive characteristic temperature-sensitive Resistance element 19,29 is powered.

On the contrary, resistance value in negative-characteristic thermistor element 39 is smaller than threshold resistance value 5.6k Ω, temperature detection electricity consumption Pressure also frequently relatively with voltage small (temperature detection voltage ＜ compares with voltage) in the case of, be judged as that negative-characteristic thermistor is first The temperature (temperature of positive characteristic thermistor resistance element 19,29) of part 39 is higher than set temperature i.e. 40 DEG C, from comparator element The leading-out terminal of Cmp1 exports positive maximum voltage, and switch element Q1 is set as ending, is stopped from power Vcc to positive characteristic temperature-sensitive Resistive element 19,29 is powered.

Moisture condensation about the Optical devices 300 (control circuit 30) being made of above structure prevents involved action, then Secondary arrangement illustrates.

By the way that power switch, that is, SW1 to be set as being connected, from power Vcc to by resistive element R1 and negative-characteristic thermistor member The temperature detection bleeder circuit that part 39 is formed and the comparison bleeder circuit being made of resistive element R2 and resistive element R3 Power supply.At the moment, since the temperature of negative-characteristic thermistor element 39 is lower than set temperature i.e. 40 DEG C, negative characteristic heat The resistance value of quick resistive element 39 is bigger than threshold resistance value 5.6k Ω, and temperature detection electricity consumption pressure ratio compares wants big with voltage, from The maximum voltage that the leading-out terminal output of comparator element Cmp1 is born, so as to which switch element Q1 becomes being connected.As a result, from electricity Source Vcc powers via switch element Q1 to positive characteristic thermistor resistance element 19,29.

The positive characteristic thermistor resistance element 19,29 for receiving power supply starts to generate heat.

It is further persistently powered, if the temperature of positive characteristic thermistor resistance element 19,29 is more than set temperature i.e. 40 DEG C, and the temperature of negative-characteristic thermistor element 39 is more than set temperature i.e. 40 DEG C, then negative-characteristic thermistor element 39 Resistance value becomes smaller than threshold resistance value 5.6k Ω, temperature detection electricity consumption buckling must compare it is small compared with voltage, from comparator The leading-out terminal of element Cmp1 exports positive maximum voltage, and switch element Q1 becomes ending.As a result, to positive characteristic temperature-sensitive electricity The power supply of resistance element 19,29 is stopped, and positive characteristic thermistor resistance element 19,29 stops fever.

Then, the Wen Duxiajiang of positive characteristic thermistor resistance element 19,29, and the temperature of negative characteristic heat-sensitive electronic component 39 Decline, if being decreased below set temperature i.e. 40 DEG C, the resistance value of negative-characteristic thermistor element 39 becomes larger than threshold resistance Value 5.6k Ω, temperature detection electricity consumption pressure, which becomes larger than, to be compared with voltage, then defeated again from the leading-out terminal of comparator element Cmp1 Go out negative maximum voltage, switch element Q1 becomes being connected.As a result, restart to positive characteristic thermistor resistance element 19,29 It is powered, positive characteristic thermistor resistance element 19,29 restarts to generate heat.

Optical devices 300 are as described above, positive characteristic of the mould-forming in the inside of resin seal composite thermistor 18 is hot Quick resistive element 19,29 is repeated the stopping of fever and restarts, and is generated heat with the temperature near set temperature i.e. 40 DEG C.

The Optical devices 300 of present embodiment are due to having control circuit 30, with the Optical devices 100 of embodiment 1 Positive characteristic thermistor resistance element 9 is compared, and positive characteristic thermistor resistance element 19,29 can be temperature controlled with higher precision to be come It generates heat.Optical devices 300 are heated using 19,29 pairs of optical filters of positive characteristic thermistor resistance element, are reliably prevented Only optical filter 3 generates moisture condensation.

[embodiment 4]

Fig. 8 is the equivalent circuit diagram that the moisture condensation of the Optical devices 400 of embodiment 4 prevents involved part.

The Optical devices 400 of embodiment 4 change the structure of the Optical devices 300 of embodiment 3.It is specific and Speech, Optical devices 400 eliminate control circuit 30 from Optical devices 300, and instead increase by being different from controlling The control circuit 40 that the circuit structure of circuit 30 processed is formed.

In Optical devices 400, negative-characteristic thermistor element 39 and the resistive element R11 of control circuit 40 series connection are connected It connects, forms temperature detection bleeder circuit, the end of 39 side of negative-characteristic thermistor element is connected to the load-side of switch SW1 (opposite side of power Vcc), the end ground connection of resistive element R11.Also, temperature detection partial pressure different from Optical devices 300 The negative-characteristic thermistor element 39 of circuit and the tie point of resistive element R11 are connected to the homophase input of comparator element Cmp1 Terminal+.

In control circuit 40, resistive element R12 and resistive element R13 are connected in series with composition and compare with bleeder circuit, resistance The end of element R12 sides is connected to the load-side of switch SW1, the end ground connection of resistive element R13 sides.Also, with Optical devices 300 is different, compare and are connected to comparator element Cmp1 with the tie point of the resistive element R12 and resistive element R13 of bleeder circuit Reversed input terminal-.

The resistance value of each element of Optical devices 400 is shown in table 2.

[table 2]

Optical devices 400 are also similary with Optical devices 300, and set temperature is set to 40 DEG C.

Negative-characteristic thermistor element 39 is also similary with Optical devices 300, uses the resistance value with 5.6k Ω at 40 DEG C Element, the threshold resistance value of negative-characteristic thermistor element 39 is 5.6k Ω.

The resistance with threshold resistance value, that is, 5.6k Ω when the temperature of itself is 40 DEG C of negative-characteristic thermistor element 39 Value.In addition, when the temperature of itself is less than 40 DEG C, there is the resistance value than threshold resistance value, that is, 5.6k Ω high.Itself When temperature is more than 40 DEG C, there is the resistance value than threshold resistance value, that is, low 5.6k Ω.

As shown in table 2, in Optical devices 400, resistive element R11 is set to 4.7k Ω, and resistive element R12 is set to 5.6k Ω, resistive element R13 are set to 4.7k Ω.

In Optical devices 400, it is about 2.74V always to compare with voltage.

In addition, negative-characteristic thermistor element 39 temperature be set temperature 40 DEG C, negative-characteristic thermistor element When 39 resistance value is threshold resistance value i.e. 5.6 Ω, temperature detection is about 2.74V with voltage.

The temperature that table 2 is shown to compare with the calculating formula of voltage and the temperature of negative-characteristic thermistor element 39 when being 40 DEG C Spend the calculating formula of detection voltage.

When the temperature of negative-characteristic thermistor element 39 is 40 DEG C, temperature detection is about 2.74V with voltage, if but negative spy Property thermistor element 39 temperature less than 40 DEG C, then the resistance value of negative-characteristic thermistor element 39 is more than 5.6k Ω, thus Temperature detection is less than 2.74V with voltage.In addition, since the structure of temperature detection bleeder circuit, wiring are different, this is dynamic Make opposite with the action of the control circuit 30 of the Optical devices 300 of embodiment 3.

On the contrary, if the temperature of negative-characteristic thermistor element 39 is more than 40 DEG C, the electricity of negative-characteristic thermistor element 39 Resistance value ratio 5.6k Ω are small, thus temperature detection electricity consumption pressure ratio 2.74V is big.Due to the structure of temperature detection bleeder circuit, Wiring is different, therefore the action is also opposite with the action of the control circuit of the Optical devices of embodiment 3 300 30.

In control circuit 40, carried out using comparator element Cmp1 to comparing electricity consumption pressure and temperature detection with the size of voltage Compare, the temperature of detection negative-characteristic thermistor element 39, the on and off of control switch element Q1.

Specifically, resistance value in negative-characteristic thermistor element 39 is bigger than threshold resistance value 5.6k Ω, temperature detection In the case that electricity consumption pressure ratio compares with voltage small (temperature detection voltage ＜ compares with voltage), it is judged as negative characteristic temperature-sensitive electricity The temperature of resistance element 39 is lower than set temperature i.e. 40 DEG C, the negative maximum electricity of the leading-out terminal output from comparator element Cmp1 Pressure, switch element Q1 is set as being connected, and is powered from power Vcc to positive characteristic thermistor resistance element 19,29.

On the contrary, resistance value in negative-characteristic thermistor element 39 is smaller than threshold resistance value 5.6k Ω, temperature detection electricity consumption In the case that pressure ratio compares with voltage big (temperature detection voltage ＞ compares with voltage), it is judged as negative-characteristic thermistor element 39 temperature is higher than set temperature i.e. 40 DEG C, exports positive maximum voltage from the leading-out terminal of comparator element Cmp1, will open It closes element Q1 to be set as ending, stops powering from power Vcc to positive characteristic thermistor resistance element 19,29.

Optical devices 400 have the control circuit 40 different from Optical devices 300, positive special in the same manner as Optical devices 300 Property thermistor element 19,29 is temperature controlled to generate heat with high precision.Optical devices 400 are also reliably prevented from Optical filter 3 generates moisture condensation.

It this concludes the description of the Optical devices 100~400 of 1~embodiment of embodiment 4.But the utility model is not limited to The above can make various changes according to the purport of utility model.

For example, Optical devices 100~400 are infrared ray sensors, but the type of Optical devices is arbitrary, and is not limited to The other kinds of Optical devices such as infrared ray sensor or camera.In addition, in Optical devices 100~400, use Pyroelectricity element 5 is used as optical element, but the change of the type with Optical devices, used optical element are also changed to not Same type.

In Optical devices 100~400, housing 1 is equipped with optical filter 3 and is used as light-transmitting member, but light-transmitting member Type be arbitrary, be not limited to the other kinds of light-transmitting member such as optical filter 3 or lens, optics cover board.

In Optical devices 100,200,9 mould-forming of positive characteristic thermistor resistance element is formed into resin in sealing resin 11 Positive temperature coefficient thermis 8 is sealed, in Optical devices 300,400, by positive characteristic thermistor resistance element 19,29, negative characteristic temperature-sensitive 39 mould-forming of resistive element forms resin seal composite thermistor 18 in sealing resin 21.But positive characteristic temperature-sensitive electricity Resistance element 9,19,29, negative-characteristic thermistor element 39 can also directly be installed on housing 1 in the form of element respectively, and nothing It need to be molded in sealing resin 11,21.

In addition, in Optical devices 100,200, resin seal positive temperature coefficient thermis 8 is installed on flexible cable 12, light Learn in device 300,400, resin seal composite thermistor 18 be installed on flexible cable 22, and by flexible cable 12, 22 back side is installed on housing 1.But flexible cable 12,22 is not essential structure in the utility model, can also be obstructed Flexible cable 12,22 is crossed, and it is by other methods that resin seal positive temperature coefficient thermis 8, the compound temperature-sensitive of resin seal is electric Resistance 18 is installed on housing 1.

In Optical devices 100~400, metal housing 1 is used, but the material of housing is arbitrary, such as also may be used To be made by resin.

Label declaration

1 housing

2 openings

3 optical filters (light-transmitting member)

4 substrates

5 pyroelectricity elements (optical element)

6a, 6b lead terminal

7a, 7b plain conductor

8 resin seal positive temperature coefficient thermis

9 positive characteristic thermistor resistance elements (PTC)

9a, 9b external electrode

10a, 10b terminal electrode

11 sealing resins

12nd, 22 flexible cable

Film on the downside of 12a

12b upper side thin membranes

13rd, 14 conductor wiring

13a, 14a connect disc electrode

15 heat conductivity double faced adhesive tapes

18 resin seal composite thermistors

19th, 29 positive characteristic thermistor resistance elements (PTC)

39 negative-characteristic thermistor elements (NTC)

Vcc power supplys

SW1 is switched

Cmp1 comparator elements

Q1 switch elements

R1, R2, R3, R11, R12, R13 resistive element

100th, 200,300,400 Optical devices (infrared ray sensor)

Claims (9)

1. a kind of Optical devices, which is characterized in that including：

Housing；

It is installed on the light-transmitting member of the housing；

The heater being configured near the light-transmitting member；And

To the power supply of the heating installation power supply,

The heater of the heater is made of positive characteristic thermistor resistance element.

2. Optical devices as described in claim 1, which is characterized in that

The light-transmitting member is lens, optical filter or optics cover board.

3. Optical devices as claimed in claim 1 or 2, which is characterized in that

The positive characteristic thermistor resistance element mould-forming is in sealing resin.

4. Optical devices as claimed in claim 1 or 2, which is characterized in that

The positive characteristic thermistor resistance element is installed on rectangular flexible cable,

The back side of the part for being equipped with the positive characteristic thermistor resistance element of the flexible cable is two-sided by heat conductivity Adhesive tape or thermal conductive adhesive are installed on the housing.

5. Optical devices as claimed in claim 1 or 2, which is characterized in that

The housing is made of metal.

6. Optical devices as claimed in claim 1 or 2, which is characterized in that further include：

The negative-characteristic thermistor element being configured near the positive characteristic thermistor resistance element；And

Based on the temperature of the negative-characteristic thermistor element, to applying from the power supply to the positive characteristic thermistor resistance element The control circuit that is controlled of electric power.

7. Optical devices as claimed in claim 6, which is characterized in that

The control circuit includes switch element, comparator element and multiple resistive elements,

The control circuit makes the positive characteristic thermistor resistance element attached with predetermined set temperature or the set temperature Near temperature fever,

The switch element is inserted between the power supply and the positive characteristic thermistor resistance element,

The comparator element controls the on and off of the switch element,

The negative-characteristic thermistor element configuration is near the positive characteristic thermistor resistance element, with the positive characteristic temperature-sensitive Resistive element thermal coupling, to approach the temperature identical with the positive characteristic thermistor resistance element, and under the set temperature Resistance value as threshold resistance value,

The negative-characteristic thermistor element is connect at least one resistance components in series, and is applied with certain voltage, So as to form temperature detection bleeder circuit,

It is defeated from the tie point of the negative-characteristic thermistor element and the resistive element of the temperature detection bleeder circuit Go out temperature detection voltage,

At least two resistance components in series connections, and be applied with certain voltage are compared so as to be formed with bleeder circuit,

The tie point of a resistive element and another resistive element from the comparison bleeder circuit exports ratio Compared with voltage,

The resistive element of the resistive element of the temperature detection bleeder circuit and the comparison bleeder circuit is each From resistance value and be respectively applied to the voltage of the temperature detection bleeder circuit and the comparison bleeder circuit The temperature being set so that in the negative-characteristic thermistor element is the set temperature, negative-characteristic thermistor member The temperature detection voltage=the comparison voltage when resistance value of part is the threshold resistance value,

In the temperature of negative-characteristic thermistor element negative-characteristic thermistor element lower than the set temperature, described When resistance value is higher than the threshold resistance value, compare described in the temperature detection voltage ＞ with voltage, in the negative characteristic The resistance value of the temperature of thermistor element negative-characteristic thermistor element higher than the set temperature, described is than the threshold value Resistance value wants hour, compares described in the temperature detection voltage ＜ with voltage, alternatively, in the negative-characteristic thermistor element Temperature negative-characteristic thermistor element lower than the set temperature, described resistance value it is bigger than the threshold resistance value When, compare with voltage described in the temperature detection voltage ＜, set described in the temperature ratio in the negative-characteristic thermistor element The resistance value of high, the described negative-characteristic thermistor element of constant temperature degree hour, temperature detection than the threshold resistance value Compare described in voltage ＞ with voltage,

Temperature detection voltage and the relatively electricity consumption pressure are compared by the comparator element, in negative characteristic heat The resistance value of the temperature of quick resistive element negative-characteristic thermistor element lower than the set temperature, described is than threshold value electricity When resistance value wants big, the switch element is set as being connected, it is warmer than the setting in the temperature of the negative-characteristic thermistor element The resistance value of high, the described negative-characteristic thermistor element of degree hour than the threshold resistance value, the switch element is set For cut-off.

8. Optical devices as claimed in claim 6, which is characterized in that

The negative-characteristic thermistor element, which is molded, to be formed in sealing resin.

9. Optical devices as claimed in claim 8, which is characterized in that

The positive characteristic thermistor resistance element and the negative-characteristic thermistor element are molded and are formed in same sealing resin.