JP2003295275A - Power source circuit for camera system - Google Patents
Power source circuit for camera systemInfo
- Publication number
- JP2003295275A JP2003295275A JP2002096030A JP2002096030A JP2003295275A JP 2003295275 A JP2003295275 A JP 2003295275A JP 2002096030 A JP2002096030 A JP 2002096030A JP 2002096030 A JP2002096030 A JP 2002096030A JP 2003295275 A JP2003295275 A JP 2003295275A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- power
- camera system
- diode
- self
- 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.)
- Granted
Links
Landscapes
- Camera Bodies And Camera Details Or Accessories (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、カメラ及び撮影レ
ンズから構成されるカメラシステム用電源回路に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for a camera system including a camera and a taking lens.
【０００２】[0002]
【従来の技術】従来、自己発電機能を有する代表的な電
池として、太陽電池が知られているが、この太陽電池を
カメラの電源として応用する例としては、特開平７−２
７０８５４号公報で開示された技術のように、太陽電池
をカメラボディまたはレンズに取付け、太陽電池から起
電される電力のみを用いて、カメラシステムを駆動する
ことが想定されている。2. Description of the Related Art Conventionally, a solar cell has been known as a typical battery having a self-power generation function. As an example of applying this solar cell as a power source for a camera, Japanese Patent Application Laid-Open No. 7-2
As in the technique disclosed in Japanese Patent No. 70854, it is assumed that the solar cell is attached to the camera body or the lens and the camera system is driven by using only the electric power generated from the solar cell.
【０００３】[0003]
【発明が解決しようとする課題】現在主流となっている
カメラシステムは、大規模な電気回路を持ち、駆動系も
複雑であるため、ますます多くの電力を消費するように
なっている。そのためカメラ内蔵電池の消耗が激しく、
頻繁に電池を交換しなければならず、撮影に少なからぬ
制限が加えれるようになってきている。これに対応する
ための一手段として太陽電池を用いた種々のシステムが
提案されている。Problems to be Solved by the Invention Currently, the mainstream camera system has a large-scale electric circuit and a complicated drive system, and thus consumes more and more power. As a result, the camera's built-in battery is very exhausted,
The batteries have to be changed frequently, and there are considerable restrictions on shooting. Various systems using solar cells have been proposed as one means for dealing with this.
【０００４】そのようなシステムでは、一般的にはニッ
カド、あるいはニッケル水素等の二次電池が使用され
る。しかしながらそれらは一次電池と比較すると高価、
かつ事前に用意しておく必要がある。また二次電池への
充電中は使用できないため、撮影時には多くの場合、複
数個用意する必要がある。さらにメモリー効果があるた
め、使用しながら充電を行うと電池の寿命を著しく短く
する。従って大電力を必要とするカメラシステムにおい
ては、このような使用法は不可能である。In such a system, a nickel-cadmium or nickel-hydrogen secondary battery is generally used. However, they are more expensive than primary batteries,
And it is necessary to prepare in advance. In addition, since it cannot be used while the secondary battery is being charged, it is necessary to prepare a plurality of batteries in many cases when photographing. Furthermore, since it has a memory effect, charging it while using it will significantly shorten the battery life. Therefore, such a usage is not possible in a camera system that requires a large amount of power.
【０００５】本発明は、上記の問題点に鑑みてなされた
ものであり、安価、かつ入手が容易な一次電池を利用し
ながら、自己発電機能を有する電池を同時に使用するこ
とを可能とすることで、一次電池の寿命を延ばし、大電
力を消費するカメラシステムの、写真撮影可能枚数を増
加させる手段を提供することを目的とする。The present invention has been made in view of the above problems, and makes it possible to simultaneously use a battery having a self-power generation function while using a primary battery that is inexpensive and easily available. It is an object of the present invention to provide a means for extending the life of a primary battery and increasing the number of pictures that can be taken in a camera system that consumes a large amount of power.
【０００６】また、本発明は、一次電池ではなく二次電
池を使用したとしても、同様に自己発電機能を有する電
池を同時に使用することで、二次電池の寿命を延ばし、
大電力を消費するカメラシステムの、写真撮影可能枚数
を増加させる手段を提供する。Further, according to the present invention, even if the secondary battery is used instead of the primary battery, the battery having the self-power generation function is also used at the same time to extend the life of the secondary battery,
Provided is a means for increasing the number of photos that can be taken in a camera system that consumes a large amount of power.
【０００７】[0007]
【課題を解決するための手段】この目的を達成するため
に、請求項１の発明は、自己発電機能を有する第１電池
と、第１電池の出力電流の逆流を防止する第１ダイオー
ドと、自己発電機能を有しない第２電池と、第２電池の
出力電流の逆流を防止する第２ダイオードと、第１ダイ
オードおよび第２ダイオードを介して第１電池および第
２電池に接続された負荷とを具備することを特徴とす
る。In order to achieve this object, the invention of claim 1 includes a first battery having a self-power generation function, and a first diode for preventing reverse flow of the output current of the first battery. A second battery that does not have a self-power generation function, a second diode that prevents reverse flow of the output current of the second battery, and a load that is connected to the first battery and the second battery via the first diode and the second diode. It is characterized by including.
【０００８】請求項２の発明は、請求項１において、第
１電池の発電量が過大となった時に、第１電池から負荷
への供給電力を制限する制限回路を更に具備することを
特徴とする。According to a second aspect of the present invention, in the first aspect, a limiting circuit is further provided for limiting the power supplied from the first battery to the load when the amount of power generated by the first battery becomes excessive. To do.
【０００９】請求項３の発明は、請求項２において、第
１電池で発電された電力を蓄える蓄電手段を更に備え、
蓄電手段は負荷と第１電池で発電された電力の大小関係
に応じて蓄電と放電とを行うことを特徴とする。According to a third aspect of the present invention, in the second aspect, there is further provided a power storage means for storing the electric power generated by the first battery,
The power storage means is characterized by performing storage and discharging according to the magnitude relation between the load and the electric power generated by the first battery.
【００１０】請求項４の発明は、請求項１乃至請求項３
において、第１電池が太陽電池であることを特徴とす
る。The invention of claim 4 is the first to third aspects of the invention.
In the above, the first battery is a solar battery.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は、本発明によるカメラシステム用電
源回路の一実施形態を示すブロック結線図である。FIG. 1 is a block connection diagram showing an embodiment of a power supply circuit for a camera system according to the present invention.
【００１３】図１において、自己発電機能を有する太陽
電池１の出力電流は、逆流防止ダイオード２を介して、
カメラシステム負荷６に供給される。また、自己発電機
能を有しないカメラ内蔵電池５（第２電池）の出力電流
は、逆流防止ダイオード３を介して、カメラシステム負
荷６に供給される。In FIG. 1, the output current of the solar cell 1 having the self-power generation function is passed through the backflow prevention diode 2 to
It is supplied to the camera system load 6. Further, the output current of the camera built-in battery 5 (second battery) having no self-power generation function is supplied to the camera system load 6 via the backflow prevention diode 3.
【００１４】太陽電池１からの電力がカメラシステム負
荷６に供給され、所定電圧（例えば９Ｖ）を超えたとき
には、カメラシステム負荷６に所定以上の電力を供給し
ないように電圧リミッタ回路４が動作し、カメラシステ
ムへの保護がなされる。。When the power from the solar cell 1 is supplied to the camera system load 6 and exceeds a predetermined voltage (for example, 9V), the voltage limiter circuit 4 operates so as not to supply the camera system load 6 with power more than the predetermined value. , Protection for the camera system is provided. .
【００１５】カメラシステム負荷６の消費電力が太陽電
池１の起電力を下回るときには、太陽電池１からの余剰
電力は大容量コンデンサ７（例えば電気二重層コンデン
サ）に蓄積され、またカメラシステム負荷６の消費電力
が太陽電池１の起電力を上回るときには、不足する電力
は大容量コンデンサ７から供給され、更に不足する電力
のみカメラ内蔵電池５から供給される。これにより太陽
電池１の起電力を有効に利用でき、かつカメラ内蔵電池
５の電力の消耗をより少なく出来る。When the power consumption of the camera system load 6 is lower than the electromotive force of the solar cell 1, the surplus power from the solar cell 1 is accumulated in the large-capacity capacitor 7 (for example, an electric double layer capacitor), and the camera system load 6 is also charged. When the power consumption exceeds the electromotive force of the solar cell 1, the insufficient power is supplied from the large-capacity capacitor 7, and only the insufficient power is supplied from the camera built-in battery 5. As a result, the electromotive force of the solar cell 1 can be effectively used, and the power consumption of the camera built-in battery 5 can be further reduced.
【００１６】本発明によるカメラシステム用電源回路を
一眼レフカメラと望遠レンズ等から成るカメラシステム
に使用したときの、カメラ動作時の太陽電池１と一次電
池であるカメラ内蔵電池５の消費電力を表した特性図を
図２に示す。When the power supply circuit for a camera system according to the present invention is used in a camera system composed of a single-lens reflex camera and a telephoto lens, the power consumption of the solar battery 1 and the camera built-in battery 5 which is a primary battery when the camera operates is shown. The characteristic diagram is shown in FIG.
【００１７】この図２において、カメラシステムの消費
電力が太陽電池１の出力電力と同等、またはそれを下回
る場合は、カメラシステムへの電力は太陽電池１から全
て供給され、余剰電力はリミッター回路４から放出され
る。またカメラシステムの消費電力が太陽電池１の出力
電力を上回る場合は、カメラシステムへの電力は太陽電
池１からの出力電力の全てと、不足分のみが一次電池で
あるカメラ内蔵電池５から供給される。In FIG. 2, when the power consumption of the camera system is equal to or less than the output power of the solar cell 1, all the power to the camera system is supplied from the solar cell 1, and the surplus power is limited by the limiter circuit 4. Emitted from. Further, when the power consumption of the camera system exceeds the output power of the solar cell 1, the power to the camera system is supplied from all the output power from the solar cell 1 and only the shortage is supplied from the camera built-in battery 5 which is the primary battery. It
【００１８】本発明によるカメラシステム用電源回路を
一眼レフカメラと望遠レンズ等からなるカメラシステム
に適用した時の、フィルム１本撮影時の消費電力概算を
図３と表１に示す。When the power supply circuit for a camera system according to the present invention is applied to a camera system including a single-lens reflex camera and a telephoto lens, an approximate power consumption when shooting one film is shown in FIG. 3 and Table 1.
【表１】 [Table 1]
【００１９】この表１で示すように、通常の晴夫時撮影
では５０％以上の電力を太陽電池１から供給できる。言
い換えれば、カメラ内蔵電池５の寿命を２倍以上に延ば
すことができる。なお、太陽光の照度は、真夏の中天時
でおよそ８００〜１０００Ｗ／ｍ2、晴天時で６００〜
８００Ｗ／ｍ2、曇天時で４００〜６００Ｗ／ｍ2、雨天
時で４００Ｗ／ｍ2以下である。従って、充分に実用に
耐えることが分かる。As shown in Table 1, 50% or more of electric power can be supplied from the solar cell 1 in normal sunny shooting. In other words, the life of the camera built-in battery 5 can be extended more than twice. In addition, the illuminance of sunlight is about 800 to 1000 W / m 2 in mid-summer and 600 to 600 W in fine weather.
800W / m 2, 400~600W / m 2 at the time of cloudy weather is 400W / m 2 or less in rainy weather. Therefore, it can be seen that it is sufficiently practical.
【００２０】なお、実施形態で説明した自己発電機能を
有する電池は、太陽電池だけでなく、ペルチェ素子や振
動による発電機も使用可能である。The battery having the self-power generation function described in the embodiment can be used not only as a solar cell but also as a Peltier element or a generator by vibration.
【００２１】[0021]
【発明の効果】以上のように、本発明のカメラシステム
用電源回路は、自己発電機能を有する第１電池と、第１
電池の出力電流の逆流を防止する第１ダイオードと、自
己発電機能を有しない第２電池と、第２電池の出力電流
の逆流を防止する第２ダイオードと、第１ダイオードお
よび第２ダイオードを介して第１電池および第２電池に
接続された負荷とを具備する。As described above, the power supply circuit for a camera system of the present invention includes the first battery having a self-power generation function and the first battery.
A first diode that prevents the reverse flow of the output current of the battery, a second battery that does not have a self-power generation function, a second diode that prevents the reverse current of the output current of the second battery, and a first diode and a second diode. And a load connected to the first battery and the second battery.
【００２２】これにより、第１電池の出力電圧が第２電
池の出力電圧を超えるときは、第１電池で発生した電力
は、すべて負荷に供給され、第１電池から供給される電
力では不足する場合にのみ、その不足分だけ第２電池か
ら供給されるようになる。即ち、自己発電機能を有する
電池と一次電池とを同時に使用することが可能となり、
大電力を消費するカメラシステムにも使用可能な電源回
路を提供することが可能となる。As a result, when the output voltage of the first battery exceeds the output voltage of the second battery, all the electric power generated in the first battery is supplied to the load, and the electric power supplied from the first battery is insufficient. Only in this case, the shortage is supplied from the second battery. That is, it becomes possible to use a battery having a self-power generation function and a primary battery at the same time,
It is possible to provide a power supply circuit that can be used even for a camera system that consumes a large amount of power.
【図１】本発明によるカメラシステム用電源回路の一実
施形態を示すブロック結線図である。FIG. 1 is a block connection diagram showing an embodiment of a power supply circuit for a camera system according to the present invention.
【図２】本発明によるカメラシステム用電源回路の一実
施形態を示す特性図である。FIG. 2 is a characteristic diagram showing an embodiment of a power supply circuit for a camera system according to the present invention.
【図３】本発明によるカメラシステム用電源回路の一実
施形態を示す特性図である。FIG. 3 is a characteristic diagram showing an embodiment of a power supply circuit for a camera system according to the present invention.
１ 太陽電池 ２ 逆流防止ダイオード ３ 逆流防止ダイオード ４ 電圧リミッタ回路 ５ カメラ内蔵電池 ６ カメラシステム負荷 ７ 大容量コンデンサ 1 solar cell 2 Backflow prevention diode 3 Backflow prevention diode 4 Voltage limiter circuit 5 Built-in camera battery 6 camera system load 7 Large-capacity capacitors
Claims (4)
と、 自己発電機能を有しない第２電池と、 該第２電池の出力電流の逆流を防止する第２ダイオード
と、 前記第１ダイオードおよび前記第２ダイオードを介して
第１電池および前記第２電池に前記接続された負荷とを
具備することを特徴とするカメラシステム用電源回路。1. A first battery having a self-power generation function, a first diode for preventing reverse flow of an output current of the first battery, a second battery having no self-power generation function, and an output current of the second battery. Power supply circuit for a camera system, comprising: a second diode for preventing the reverse flow of the battery; and a load connected to the first battery and the second battery via the first diode and the second diode. .
に、前記第１電池から前記負荷への供給電力を制限する
制限回路を更に具備することを特徴とする請求項１に記
載のカメラシステム用電源回路。2. The method according to claim 1, further comprising a limiting circuit that limits the power supplied from the first battery to the load when the amount of power generation of the first battery becomes excessive. Power supply circuit for camera system.
電手段を更に備え、該蓄電手段は前記負荷と前記第１電
池で発電された電力の大小関係に応じて蓄電と放電とを
行うことを特徴とする請求項２に記載のカメラシステム
用電源回路。3. A power storage means for storing the power generated by the first battery, the power storage means performing power storage and discharging according to the magnitude relation between the load and the power generated by the first battery. The power supply circuit for a camera system according to claim 2, wherein the power supply circuit is for a camera system.
徴とする請求項１乃至請求項３に記載のカメラシステム
用電源回路。4. The power supply circuit for a camera system according to claim 1, wherein the first battery is a solar battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002096030A JP4168647B2 (en) | 2002-03-29 | 2002-03-29 | Power supply circuit for camera system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002096030A JP4168647B2 (en) | 2002-03-29 | 2002-03-29 | Power supply circuit for camera system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003295275A true JP2003295275A (en) | 2003-10-15 |
| JP4168647B2 JP4168647B2 (en) | 2008-10-22 |
Family
ID=29239270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002096030A Expired - Fee Related JP4168647B2 (en) | 2002-03-29 | 2002-03-29 | Power supply circuit for camera system |
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| Country | Link |
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| JP (1) | JP4168647B2 (en) |
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| JPH0759271A (en) * | 1991-09-13 | 1995-03-03 | S Ii Project Kk | Solar power generating/storing system |
| JPH06289483A (en) * | 1993-04-05 | 1994-10-18 | Canon Inc | Camera |
| JPH07197714A (en) * | 1993-12-29 | 1995-08-01 | Mitsui Mining & Smelting Co Ltd | Transmitter for remote control with receiving function |
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| JPH08201898A (en) * | 1995-01-25 | 1996-08-09 | Canon Inc | Power source apparatus for camera |
| JPH10210682A (en) * | 1997-10-29 | 1998-08-07 | Shigeo Yamamoto | Solar battery drive circuit |
| JPH11176405A (en) * | 1997-12-10 | 1999-07-02 | Nikon Corp | Instrument using battery pack |
| JP2000250646A (en) * | 1999-02-25 | 2000-09-14 | Nippon Telegr & Teleph Corp <Ntt> | Independent photovoltaic power generation system and method |
| JP2002078231A (en) * | 2000-08-25 | 2002-03-15 | Jeol Ltd | Photovoltaic power generation system |
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| JP4168647B2 (en) | 2008-10-22 |
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