JP4072098B2 - Mobile device - Google Patents

Description

ただし、Ｚを光の進行方向を正とした光軸（軸上主光線）とし、ｙを光軸と鉛直な方向にとる。ここで、Ｒは近軸曲率半径、ｋは円錐定数、ａ、ｂ、ｃ、ｄ、・・・はそれぞれ４次、６次、８次、１０次の非球面係数である。この定義式のＺ軸が回転対称非球面の軸となる。なお、データの記載されていない非球面に関する項は０である。
【００２８】
図５に示したのは、実施例１の撮像光学系の光路図である。本実施例の撮像光学系は、物体側から順に、正屈折力の第１レンズ２０と、明るさ絞り２１と、負屈折力の第２レンズ２２と、正屈折力の第３レンズ２３とで構成されている。なお、２４は、ＣＭＯＳイメージセンサ（撮像素子）である。
第１レンズ２０は、物体側に凸面を向けたレンズである。第２レンズ２２は、物体側に凸面を向けたメニスカスレンズである。
非球面は、第１レンズ２０の両面、第２レンズ２２の両面、第３レンズ２３の両面に設けられている。
本実施例の光学系は、トリプレットの光学パワー配置になっている。この光学系では、第１レンズ２０がガラスで、第２レンズ２２及び第３レンズ２３がプラスチックで構成されている。また、用いているプラスチックは、それぞれ、ポリカーボネート、ポリオレフィン系のプラスチック、例えば、ゼオネックス（登録商標）である。
また、光学系のスペックは、焦点距離４．５ｍｍ、Ｆナンバー２．４、全画角が６７°で広角の光学系である。この光学系の全長は６．２ｍｍと非常に小さい値となっている。
【００２９】

【００３０】

【００３１】
図６に示したのは、実施例２の撮像光学系の光路図である。本実施例の撮像光学系は、物体側から順に、負屈折力の第１レンズ３０と、正屈折力の第２レンズ３１と、明るさ絞り３２と、正屈折力の第３レンズ３３と、正屈折力の第４レンズ３４で構成されている。なお、３５はフィルター、３６はＣＭＯＳイメージセンサ（撮像素子）である。
第１レンズ３０は、物体側に凹面を向けたメニスカスレンズである。第２レンズ３１は、物体側に凹面を向けたメニスカスレンズレンズである。第３レンズ３３は、像側に凹面を向けたメニスカスレンズレンズである。第４レンズ３４は両凸レンズである。
非球面は、第１レンズ３０の像側面、第２レンズ３１の像側面、第４レンズ３４の像側面に設けられている。
本実施例の光学系は、全てのレンズがプラスチックで構成されている。ここで、第１レンズ３０，第３レンズ３３及び第４レンズ３４がポリオレフィン系のプラスチック、例えば、ゼオネックス（登録商標）であり、第２レンズ３１がスチレン系のプラスチック、例えば、エスチレン（登録商標）である。
また、光学系のスペックは、焦点距離１．５ｍｍ、Ｆナンバー３．０、全画角が６６°で広角の光学系である。光学系の全長は６．３ｍｍと非常に小さい値となっている。
【００３２】

【００３３】

【００３４】
小型・軽量な携帯端末では、撮像装置も小型であることが求められるため、全長の制限がある。したがって、撮像光学系は以下の条件式を満足することが好ましい。
（１−１） ０．５ ＜ ｆ ＜ １０．０
ただし、ｆ(mm)は撮像装置の撮像光学系の焦点距離である。
上記条件を満足すると、撮像光学系の全長を短くすることができる。上記条件式の上限を上回ると、撮像光学系の全長が大きくなる。従って、小型で軽量な携帯端末を提供することが困難となる。
他方、下限を下回ると、撮像光学系のパワーが大きくなる。そのため、収差が発生し、高性能な撮像装置を提供できなくなってしまう。
【００３５】
上記条件式の代わりに、次の条件式を満足すればより望ましい。
（１−２） １．０ ＜ ｆ ＜ ６．０
上記条件式の代わりに、次の条件式を満足すればより望ましい。
（１−３） １．２ ＜ ｆ ＜ ４．８
【００３６】
また、小型・軽量な携帯端末では、撮像素子を小さくすることで撮像装置を小型化できる。高画素で小型な撮像素子の場合、画素が非常に小さくなる。そのため、光学系を明るくして回折ボケを回避する必要がある。また、回折限界の影響がないとしても、光学系が暗いと光源を用意する必要がある。そのため、スペースや電力が必要となる。従って、撮像光学系において、以下の条件式を満足すると良い。
（２−１） １．０ ＜ Ｆｎｏ ＜ ５．０
ただし、Ｆｎｏは撮像光学系のＦナンバーである。
上記条件式の上限を上回ると、撮像光学系が暗くなりすぎる。その結果、回折ボケにより良好な像が得られなくなってしまう。もしくは、携帯端末に光源が必要となり、装置が大型化し、かつ電力の消費量が大きくなる。その結果、携帯端末としては望ましくない構成となってしまう。
他方、下限を下回ると、撮像光学系のＦｎｏが小さくなりすぎる。従って、性能を確保するためには、レンズ枚数が増加するため、全長が大きくなってしまう。また、焦点深度が浅くなるため、光学系と撮像素子の高い組み立て精度が必要となる。よって、小型で軽量・低コストな携帯端末を提供できなくなる。
【００３７】
上記条件式の代わりに、次の条件式を満足すればより望ましい。
（２−２） １．５ ＜ Ｆｎｏ ＜ ４．２
上記条件式の代わりに、次の条件式を満足すればより望ましい。
（２−３） ２．０ ＜ Ｆｎｏ ＜ ３．４
【００３８】
各実施例の撮像光学系は、以下に示すように条件を満足している。

上述した各実施例の撮像光学系を用いることにより、乱数発生回路１４を内蔵させても小型かつ軽量である携帯電話機１を製造することが可能となる。
【００３９】
なお、本実施形態において、乱数発生装置１４により乱数を２つ発生させたが、１つであっても良い。また、撮影手段はディスプレイ６を設けた面に対し反対側の面に設けられていることが望ましい。また、シャッターボタンはディスプレイ６と同一面に設けられていることが望ましい。
【００４０】
なお、文字や画像を表示する手段として単にディスプレイ６と称したが、例えば、カラー液晶表示装置（例えば、２５６色反射型ＳＴＮカラー液晶表示装置）、ＤＭＤ（デジタル・ミラー・デバイス）や有機ＥＬ表示装置、ＰＤＰ（プラズマ・ディスプレイ・パネル）などから構成されていても良い。
【００４１】
また、撮影装置を単に内蔵カメラ１２と称したが、例えばＣＣＤやＣ−ＭＯＳ人工網膜ＩＣ（例えば、三菱電機製Ｍ６４２７０ＡＧ：レンズ付き人工網膜ＬＳＩ）により構成される。また携帯電話機など厚みの薄いところへレンズを配置する場合、レンズ全長より焦点距離を長くとれるように、レンズ構成はテレフォトタイプが望ましい。
また、撮影の実行方法としてキー操作入力を適応したが、これに限定されるものではない。例えば、音声入力により、撮影を実行するようにしてもよい。
【００４２】
また、上記実施形態では、報知ユニットとしてサウンダ１１を用いたが、これに限定されるものではない。発光部材、例えばＬＥＤ３を、報知ユニットとして兼用してもよい。この発光部材を用いて、第１の報知情報や第２の報知情報を発信することができる。また、携帯電話機１に、発光部材として、新たにＬＥＤ等を設けるようにしてもよい。また、発光部材として、フラッシュ光を用いることもできる。このフラッシュ光を被写体に向けて発光することで、被写体となった人に、撮影が行われようとしたことを知らせることができる。
また、携帯電話機１には、着信を報知するためのバイブレーター機能（振動部材）が備えられている。この場合は、それを報知ユニットとして兼用してもよい。この振動部材を用いて、第１の報知情報や第２の報知情報を発信することができる。また、携帯電話機に、報知ユニットとして、新たに振動発生部材を設けるようにしてもよい。
【００４３】
なお、これら音発生部材、発光部材及び振動発生部材による報知は、用途に応じて複合させて構成してもよい。そして、このような構成によっても、本実施例のような報知ユニットを音発生部材で構成した場合と同様の効果が得られる。
【００４４】
なお、本発明は、上記実施例に限定されるものではなく、次のような変形、拡張が可能である。本発明の実施例では、携帯電話機本体２を折り畳み式で構成したものに適用したが、これに限定されるものではなく、例えば、矩筒形の一胴体や矩筒形の２つの胴体をスライド式にした携帯電話機に適応してもよい。また、携帯端末を静止画像が撮像可能なデジタルカメラ機能付きの携帯電話機１に適用したが、これに限定されるものではなく、動画像が撮像可能なものに適用してもよい。なお、携帯端末をデジタルカメラ機能付きの携帯電話機に適用したが、これに限定されるものではなく、例えば、簡易型携帯電話機やＰＤＡ（personal digital assistant）全般に適用することが可能である。なお、撮像素子をＣＭＯＳイメージセンサに適用したが、これに限定されるものではなく、例えば、ＣＣＤ（charge coupled device）カメラに適用してもよい。
【００４５】
なお、本発明の携帯端末では、撮像素子上に形成された像の画像を表示する表示素子が備えられている。これにより、撮影ユニットにより得られた画像が、表示素子にリアルタイムで表示される。よって、盗撮を目的としない場合は、撮影者が表示素子で被写体を確認しながら撮影を行うことができる。その結果、撮影がより簡単に行える。
【００４６】
また、本発明の携帯端末では、表示素子を設けた面とは反対側の面に、撮影ユニットが設けられている。これにより、表示素子をファインダとして使用することが可能となる。すなわち、盗撮を目的としない場合は、表示素子によって、撮影者は被写体を確認しながら撮影を行うことができる。そのため、撮影がより簡便に行える。
【００４７】
また、本発明の携帯端末では、撮影ボタンが、表示素子と同一面に設けられている。これにより、撮影ボタンが撮影者側に位置しているため、撮影するときに手ぶれが生じなくなる。
【００４８】
【発明の効果】
以上説明したように、本発明に係る携帯端末によれば、撮影毎に、撮影を実行できるキーが変化する。すなわち、ディスプレイに表示された数値を入力できた場合のみに、撮影が可能となる。このため、表示手段を確認せずに連続した撮影は、困難となる。よって、悪意の使用者による撮影、例えば盗撮等の反社会的行為を防止することができる。
【図面の簡単な説明】
【図１】 本発明の一実施形態に係る携帯端末の（ａ）正面図及び（ｂ）背面図の斜視図である。
【図２】 本発明の一実施形態に係る携帯端末の構成を示すブロック図である。
【図３】 本発明の一実施形態に係る撮影の実行及び禁止までの処理の流れを示すフローチャート図である。
【図４】 本発明の一実施形態に係る撮影の実行及び禁止までの別の処理の流れを示すフローチャート図である。
【図５】 本発明の一実施形態に係る携帯端末に用いられる光学系の、第１実施例の光路図である。
【図６】 本発明の一実施形態に係る携帯端末に用いられる光学系の、第２実施例の光路図である。
【符号の説明】
１ 携帯電話機（携帯端末）
６ ディスプレイ（表示ユニット）
１２ 内臓レンズ（撮影ユニット）
１０ 数字キー（入力ユニット）
１１ サウンダ（報知ユニット）
１４ 乱数発生回路（乱数発生ユニット）
１８ メモリ（画像記憶ユニット）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable terminal having a camera function.
[0002]
[Prior art]
Conventionally, mobile terminals such as mobile phones, mobile mobile phones, and information communication terminals (PDAs) have become widespread, and those equipped with digital camera functions (hereinafter simply referred to as camera functions) have been supplied. I came. For example, a mobile phone with a camera function can easily obtain a still image or a moving image (hereinafter simply referred to as an image) of a subject simply by pointing the camera at a subject to be photographed and pressing a shutter button. The obtained image is recorded and stored in a memory as image data, for example. The image can be transmitted as an attachment to an e-mail, or displayed as a standby screen or an incoming screen. Also, image data can be easily deleted from the memory when it is no longer needed.
Such a mobile phone with a camera function has an advantage that the other party can easily understand the contents that are difficult to convey only by text by sending the image data to the other party. In addition, by sending image data, it is possible to quickly grasp the current situation while being far away.
[0003]
However, when the subject can be easily photographed, it is possible to photograph from a low position, for example, by taking advantage of the convenience. For this reason, it is expected that malicious users appearing in antisocial acts such as voyeurism. In this case, since the voyeurized image data can be easily deleted, there arises a problem that it does not remain as malicious evidence.
Occurs.
[0004]
In order to solve this problem, a portable terminal having means for preventing voyeurism has been proposed (see, for example, Patent Document 1). In the portable terminal of Patent Document 1, shooting is prohibited when the portable terminal body is tilted at an unnatural angle.
[0005]
[Patent Document 1]
JP 2002-290818 A
[0006]
[Problems to be solved by the invention]
However, even when shooting is not performed for the purpose of voyeurism, shooting is prohibited within the shooting prohibition angle range. As a result, there is a problem that the photographing range is remarkably limited.
[0007]
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a portable terminal that is difficult to voyeurize. It is another object of the present invention to provide a portable terminal whose shooting range is not limited when shooting is not intended for voyeur photography. It is another object of the present invention to provide a portable terminal that is small and has good operability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is directed to an imaging unit having an imaging optical system and an imaging element, an image storage unit for storing an image obtained by the imaging unit, and an input for inputting numbers. A unit, a random number generating unit for generating a random number, and a display unit for displaying the image or the number, and only when the number displayed on the display unit matches the number input by the input unit, Provided is a portable terminal on which shooting is performed.
[0009]
According to the present invention, when the subject is imaged, a random numerical value generated by the random number generation unit is displayed on the display unit. Then, the photographer inputs the same number as the displayed value using the input unit. Here, when the input number is different from the displayed number, shooting is not performed. That is, the photographer can take a picture only when the inputted number matches the displayed number (or is the same). Therefore, at this time, the number generated by the random number generation unit changes for each photographing. Therefore, continuous shooting is difficult, and voyeurism can be prevented.
[0010]
According to a second aspect of the present invention, in the portable terminal according to the first aspect, the portable terminal includes a notification unit having at least one of first notification information and second notification information, and the first notification information is the shooting information. Is provided for notifying that the image cannot be executed, and the second notification information is information for notifying that the photographing can be executed.
The invention according to claim 3 provides the portable terminal according to claim 2, wherein the notification unit includes a sound generating member that generates a predetermined sound.
According to a fourth aspect of the present invention, there is provided the portable terminal according to the second aspect, wherein the notification unit includes a sound generating member that generates predetermined light.
The invention according to claim 5 provides the mobile terminal according to claim 2, wherein the notification unit includes a vibration generating member that generates a predetermined vibration.
According to these inventions, when the notification unit has the first notification information, voyeurism can be prevented using the notification information. In addition, it is possible to notify the photographer that shooting is not possible (shooting prohibited state).
Further, when the notification unit has the second notification information, it is possible to notify the photographer that the shooting can be performed (shooting enabled state) by the second notification information.
[0011]
The invention according to claim 6 provides a portable terminal in which the predetermined sound is different between the first notification information and the second notification information.
The invention according to claim 7 provides a portable terminal in which the predetermined light is different between the first broadcast information and the second broadcast information.
The invention according to claim 8 provides a portable terminal in which the predetermined vibration is different between the first notification information and the second notification information.
According to these inventions, it is possible to distinguish whether the first notification information is notified or the second notification information is notified.
[0012]
The invention according to claim 10 proposes a portable terminal that satisfies the following expression when the focal length of the imaging optical system is f (mm).
0.5 <f <10.0
According to the present invention, the occurrence of aberration in the imaging optical system can be suppressed, and a high-performance imaging unit can be provided. Further, the overall length of the photographing unit can be shortened, and a small photographing unit and a portable terminal can be provided.
[0013]
According to an eleventh aspect of the present invention, the F number of the imaging optical system is F _no Then, we propose a mobile terminal that satisfies the following formula.
1.0 <F _no <5.0
According to the present invention, since an appropriate light spot diameter can be obtained even if the image pickup device is downsized, diffraction blur can be prevented. Moreover, since the imaging optical system does not become extremely dark, there is no need for a new light source. Therefore, an increase in the size of the mobile terminal and an increase in power consumption can be suppressed.
In addition, since the number of lenses does not increase to ensure performance, it is possible to prevent the imaging optical system from becoming large. In addition, since the depth of focus does not become shallow, there is no need for high assembly accuracy in the assembly of the imaging optical system. As a result, it is possible to provide a light-weight, low-cost and small photographing unit and portable terminal.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a mobile terminal according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a mobile phone (mobile terminal) 1 with a camera function according to the present embodiment has an LED 3 for notifying an incoming call or a charge state, and a speaker 4 for outputting a received voice on the front of the mobile phone body 2. , A microphone 5 for inputting a transmitted voice, a liquid crystal display (display unit) 6 for displaying characters and images, a call start key 7, a call end key 8, a scroll key 9, and a numeric key (number input) Means) 10. Here, the numeric key 10 functions as a shutter button during shooting.
In addition, a sounder 11 (notification unit) for outputting a ring tone and a warning sound and a built-in camera 12 for photographing a subject are provided on the back surface of the mobile phone body 2. In addition, an antenna 13 is arranged on the upper part of the mobile phone main body 2, and a random number generation circuit (random number generation unit) 14 for generating a random number is provided inside.
The built-in camera 12 is a photographing unit, and includes an imaging optical system for photographing a subject and an imaging element. This imaging optical system will be described later.
[0015]
FIG. 2 is a block diagram showing a configuration of the mobile terminal 1. In this figure, the control circuit 15 includes a random number generation circuit 14, a display 6, an operation key unit 16, an LED 3, a sounder 11, an audio processing unit 17, and a memory (image storage) that stores a captured image. Unit) 18 is connected. Therefore, the control circuit 15 can control each part. In addition, the control circuit 15 includes a storage restriction unit 19.
The operation key unit 16 includes a call start key 7, a call end key 8, a scroll key 9, and a numeric key 10. The audio processing unit 17 includes a microphone 5 and a speaker 4.
[0016]
The random number generation circuit 14 generates two 1-digit random numbers (numbers) from 0 to 9. The two numbers are displayed on the display 6 by the control circuit 15 at every photographing.
The storage restriction unit 19 compares the number displayed on the display 6 with the number input from the number key 10. Note that the input using the numeric key 10 is achieved by pressing the numeric key 10. If the displayed number is the same as the input number, shooting is performed.
[0017]
The operation of the mobile phone 1 configured as described above will be described. FIG. 3 is a flowchart showing a flow of processing up to execution and prohibition of photographing. First, a photographing mode capable of photographing is set by the photographer (step S1). In the shooting mode, the subject captured by the built-in camera 12 is displayed on the display 6 as an image. Here, the photographer points the built-in camera 12 toward the subject to be photographed. Then, the subject to be photographed is confirmed from the image displayed on the display 6.
At this time, a random number is generated by the random number generation circuit 14 (step S2). Thereby, a combination is determined by two random numbers. The combination of these two numerical values determines the numeric key 10 serving as a shutter button. These two numbers are displayed on the display 6 (step S3). Here, the control circuit 15 starts measuring time (step S4). Then, the control circuit 15 starts measuring time and detects whether or not the numeric key 10 has been pressed within a predetermined time (step S5). If the numeric key 10 is not pressed within a predetermined time, shooting is not performed. In this case, the process returns to determining a combination of random numerical values.
On the other hand, when the numeric key 10 is pressed within a predetermined time, the memory of the image displayed on the display 6 is stored in the memory 18 (step S6). The numerical information of the pressed numeric key 10 is transmitted to the control circuit 15. The control circuit 15 determines whether the displayed number is the same as the pressed number in the storage restriction unit 19 (step S7). Here, when the displayed number is the same as the pressed number, the control circuit 15 permits photographing. In this case, the image data stored in the memory 18 is saved. As a result, photographing has been executed. After that, the camera returns to a state where photographing can be performed again.
[0018]
If the displayed number is not the same as the pressed number, the control circuit 15 prohibits shooting. In this case, for example, the image data stored in the memory 18 is deleted (discarded) (step S9). As a result, shooting is not executed. After that, the camera returns to a state where photographing can be performed again.
Further, by performing a predetermined operation, the shooting mode can be canceled and the shooting can be ended (step S8).
[0019]
As described above, in the mobile phone 1 according to the present embodiment, the numeric key 10 serving as the shutter button changes every time the image is taken. Therefore, the photographer must confirm the number displayed on the display 6 for each photographing. If the numeric key 10 corresponding to the displayed numerical value is not pressed, shooting is not executed. That is, continuous shooting is prohibited without looking at the display 6. This prevents voyeurism by continuous shooting.
If continuous shooting is performed, the display 6 must be seen, so that the operation stands out from the surroundings and voyeurism cannot be performed. In addition, it is possible to prohibit photographing quickly and instantly so as not to notice the surroundings, such as voyeurism.
[0020]
In this embodiment, by using the display 7 as a viewfinder, it is possible to take a picture while checking the subject. In addition, since the numeric keys 10 are provided on the same surface as the display 7, shooting is easier.
In addition, when the process of step S8 or the process of step S9 is completed, it is preferable to notify that the process is completed.
[0021]
Next, a mobile terminal according to a second embodiment of the present invention will be described with reference to the drawings. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 4 is a flowchart showing another processing flow until execution and prohibition of photographing. In the first embodiment, when the pressing of the numeric key 10 is detected, the image data is stored. However, it is not necessary to store image data as in this embodiment.
First, as in the first embodiment, the shooting mode is set (step S1), and the built-in camera 12 is directed toward the subject. In this state, an image obtained by the built-in camera 12 is displayed on the display 6. Then, the subject to be photographed is confirmed from the image displayed on the display 6. Even in this embodiment, shooting starts when the numeric key 10 is pressed.
[0022]
Also in this embodiment, a random number is generated by the random number generation circuit 14 (step S2). Thereby, a combination is determined by three random numerical values. The combination of these three numerical values determines the numeric key 10 serving as the shutter button. Then, these three numbers are displayed on the display 6 (step S3). Here, the control circuit 15 starts measuring time (step S4). Then, the control circuit 15 starts measuring time and detects whether or not the numeric key 10 has been pressed within a predetermined time (step S5). If the numeric key 10 is not pressed within a predetermined time, shooting is not performed. In this case, the process returns to determining a combination of random numerical values.
On the other hand, when the numeric key 10 is pressed within a predetermined time, the numerical information of the pressed numeric key 10 is transmitted to the control circuit 15. The control circuit 15 determines whether the displayed number and the pressed number are the same in the storage restriction unit 19 (step S6). Here, when the displayed number is the same as the pressed number, the control circuit 15 executes photographing. In this case, the image data (image data obtained by the built-in camera 12) displayed on the display 6 is stored (step S7). As a result, photographing has been executed. After that, the camera returns to a state where photographing can be performed again.
If the displayed number is not the same as the pressed number, the processing unit 13 does not perform shooting. In this case, the image data displayed on the display 6 is not stored. As a result, shooting is not executed. Further, a warning sound is generated (step S9). After that, the camera returns to a state where photographing can be performed again.
Further, by performing a predetermined operation, the shooting mode can be canceled and the shooting can be ended (step S8).
[0023]
According to said structure, the effect similar to 1st Embodiment can be acquired. In the present embodiment, when shooting is not executed (step S9), a warning sound is emitted from the sounder 10. Therefore, the photographer can easily recognize that the photographing has not been executed. Further, since the warning sound can be heard by the surrounding people, there is also an effect of informing the surrounding people. Further, when shooting is performed (step S7), a sound different from the warning sound may be generated. Then, the photographer can recognize that the photographing has been executed.
[0024]
In addition, by using the display 7 as a finder, it is possible to take a picture while checking the subject. At that time, since the shutter key 4 is provided on the same surface as the display 7, photographing becomes easier.
[0025]
As described above, it is preferable that at least one of the two pieces of notification information is notified by the sounder 11. One is information (first notification information) for notifying that photographing cannot be performed. Another one is information (second notification information) for notifying that shooting can be executed or that shooting has been completed.
When the first notification information is output from the sounder 11 as a sound, it is possible to allow the surrounding people to recognize that shooting is being performed or that shooting has been performed as described above. Therefore, it becomes easier to prevent voyeurism. Further, when the second notification information is output from the sounder 11 as sound, the photographer can recognize that photographing can be executed. Therefore, the photographer can take images with good timing. Alternatively, the photographer can recognize that photographing has been completed. Therefore, the photographer can move to the next shooting.
In other embodiments, it is preferable to adopt such a configuration.
[0026]
When two or more pieces of notification information are output, it is preferable that the volume, the sound range, the sound generation time, and the like are different for each piece of notification information. Further, as described above, light or vibration may be used instead of sound. In this case, the intensity and frequency of light and vibration, the light emission time, the vibration time, and the like are preferably made different for each piece of notification information.
[0027]
Next, specific numerical examples of the imaging optical system used in the portable terminal of the present embodiment will be described below.
In a numerical data table to be described later, r is a radius of curvature and d is a surface interval. N _d Is the refractive index, ν _d Represents the Abbe number and both are values on the d-line. Each optical path diagram shown in FIGS. 5 and 6 includes r in the numerical data table. _i , D _i Correspondence with is shown.
An aspherical surface is a rotationally symmetric aspherical surface given by the following definition.

However, Z is an optical axis (axial principal ray) with the traveling direction of light as positive, and y is perpendicular to the optical axis. Here, R is a paraxial radius of curvature, k is a conic constant, a, b, c, d,... Are fourth-order, sixth-order, eighth-order, and tenth-order aspherical coefficients, respectively. The Z axis of this defining formula is the axis of a rotationally symmetric aspherical surface. The term relating to the aspherical surface for which no data is described is zero.
[0028]
FIG. 5 is an optical path diagram of the imaging optical system according to the first embodiment. The imaging optical system of the present embodiment includes, in order from the object side, a first lens 20 having a positive refractive power, an aperture stop 21, a second lens 22 having a negative refractive power, and a third lens 23 having a positive refractive power. It is configured. Reference numeral 24 denotes a CMOS image sensor (imaging device).
The first lens 20 is a lens having a convex surface facing the object side. The second lens 22 is a meniscus lens having a convex surface facing the object side.
The aspheric surfaces are provided on both surfaces of the first lens 20, both surfaces of the second lens 22, and both surfaces of the third lens 23.
The optical system of the present embodiment has a triplet optical power arrangement. In this optical system, the first lens 20 is made of glass, and the second lens 22 and the third lens 23 are made of plastic. The plastics used are polycarbonate and polyolefin plastics such as ZEONEX (registered trademark), respectively.
The specs of the optical system are a wide-angle optical system with a focal length of 4.5 mm, an F number of 2.4, a total angle of view of 67 °. The total length of this optical system is a very small value of 6.2 mm.
[0029]

[0030]

[0031]
FIG. 6 is an optical path diagram of the image pickup optical system according to the second embodiment. The imaging optical system of the present embodiment includes, in order from the object side, a first lens 30 having a negative refractive power, a second lens 31 having a positive refractive power, an aperture stop 32, and a third lens 33 having a positive refractive power, The fourth lens 34 has a positive refractive power. Reference numeral 35 denotes a filter, and 36 denotes a CMOS image sensor (imaging device).
The first lens 30 is a meniscus lens having a concave surface facing the object side. The second lens 31 is a meniscus lens lens having a concave surface facing the object side. The third lens 33 is a meniscus lens lens having a concave surface facing the image side. The fourth lens 34 is a biconvex lens.
The aspheric surfaces are provided on the image side surface of the first lens 30, the image side surface of the second lens 31, and the image side surface of the fourth lens 34.
In the optical system of this embodiment, all the lenses are made of plastic. Here, the first lens 30, the third lens 33, and the fourth lens 34 are polyolefin plastic, for example, Zeonex (registered trademark), and the second lens 31 is styrene plastic, for example, styrene (registered trademark). It is.
The specs of the optical system are a wide-angle optical system with a focal length of 1.5 mm, an F number of 3.0, a total angle of view of 66 °. The total length of the optical system is a very small value of 6.3 mm.
[0032]

[0033]

[0034]
In a small and light portable terminal, the imaging device is also required to be small, so that there is a limitation on the total length. Therefore, it is preferable that the imaging optical system satisfies the following conditional expression.
(1-1) 0.5 <f <10.0
Here, f (mm) is a focal length of the image pickup optical system of the image pickup apparatus.
When the above conditions are satisfied, the overall length of the imaging optical system can be shortened. If the upper limit of the conditional expression is exceeded, the total length of the imaging optical system becomes large. Therefore, it is difficult to provide a small and lightweight portable terminal.
On the other hand, below the lower limit, the power of the imaging optical system increases. As a result, aberration occurs, and a high-performance imaging device cannot be provided.
[0035]
It is more desirable if the following conditional expression is satisfied instead of the above conditional expression.
(1-2) 1.0 <f <6.0
It is more desirable if the following conditional expression is satisfied instead of the above conditional expression.
(1-3) 1.2 <f <4.8
[0036]
In a small and lightweight portable terminal, the image pickup device can be downsized by reducing the image pickup element. In the case of a small image sensor with high pixels, the pixels are very small. Therefore, it is necessary to brighten the optical system and avoid diffraction blur. Even if there is no influence of the diffraction limit, it is necessary to prepare a light source when the optical system is dark. Therefore, space and electric power are required. Therefore, it is preferable that the following conditional expression is satisfied in the imaging optical system.
(2-1) 1.0 <Fno <5.0
Here, Fno is the F number of the imaging optical system.
When the upper limit of the conditional expression is exceeded, the imaging optical system becomes too dark. As a result, a good image cannot be obtained due to diffraction blur. Alternatively, a light source is required for the portable terminal, the apparatus becomes large, and the power consumption increases. As a result, the portable terminal is not desirable.
On the other hand, below the lower limit, Fno of the imaging optical system becomes too small. Therefore, in order to ensure the performance, the total number of lenses increases, so the total length becomes large. Moreover, since the depth of focus becomes shallow, high assembly accuracy of the optical system and the image sensor is required. Therefore, it becomes impossible to provide a small, lightweight, and low-cost portable terminal.
[0037]
It is more desirable if the following conditional expression is satisfied instead of the above conditional expression.
(2-2) 1.5 <Fno <4.2
It is more desirable if the following conditional expression is satisfied instead of the above conditional expression.
(2-3) 2.0 <Fno <3.4
[0038]
The imaging optical system of each example satisfies the conditions as shown below.

By using the imaging optical system of each embodiment described above, it is possible to manufacture a small and lightweight mobile phone 1 even if the random number generation circuit 14 is incorporated.
[0039]
In the present embodiment, two random numbers are generated by the random number generator 14, but one random number may be used. The photographing means is preferably provided on the surface opposite to the surface on which the display 6 is provided. The shutter button is preferably provided on the same surface as the display 6.
[0040]
Although the display 6 is simply referred to as a display 6 for displaying characters and images, for example, a color liquid crystal display device (for example, a 256 color reflective STN color liquid crystal display device), a DMD (digital mirror device), or an organic EL display is used. An apparatus, a PDP (plasma display panel), or the like may be used.
[0041]
Further, although the photographing apparatus is simply referred to as the built-in camera 12, it is configured by, for example, a CCD or a C-MOS artificial retina IC (for example, M64270AG manufactured by Mitsubishi Electric: an artificial retina LSI with a lens). When the lens is arranged in a thin place such as a mobile phone, the lens configuration is preferably a telephoto type so that the focal length can be longer than the entire lens length.
In addition, although key operation input is applied as a shooting execution method, the present invention is not limited to this. For example, photographing may be executed by voice input.
[0042]
Moreover, in the said embodiment, although the sounder 11 was used as an alerting | reporting unit, it is not limited to this. A light emitting member, for example, LED 3 may also be used as a notification unit. The first notification information and the second notification information can be transmitted using the light emitting member. Further, the mobile phone 1 may be newly provided with an LED or the like as a light emitting member. Further, flash light can also be used as the light emitting member. By emitting the flash light toward the subject, it is possible to notify the person who has become the subject that shooting has been attempted.
In addition, the mobile phone 1 is provided with a vibrator function (vibrating member) for notifying incoming calls. In this case, it may be used as a notification unit. Using this vibrating member, the first notification information and the second notification information can be transmitted. Moreover, you may make it provide a vibration generation member newly as a alerting | reporting unit in a mobile telephone.
[0043]
Note that the notification by the sound generating member, the light emitting member, and the vibration generating member may be combined according to the application. Even with such a configuration, the same effect as that obtained when the notification unit as in the present embodiment is configured by a sound generating member can be obtained.
[0044]
In addition, this invention is not limited to the said Example, The following deformation | transformation and expansion are possible. In the embodiment of the present invention, the cellular phone main body 2 is applied to a folding type. However, the present invention is not limited to this. For example, one rectangular body or two rectangular cylinders are slid. You may apply to the cellular phone made into a formula. Further, although the mobile terminal is applied to the mobile phone 1 with a digital camera function capable of capturing a still image, the present invention is not limited to this and may be applied to a mobile phone capable of capturing a moving image. Although the mobile terminal is applied to a mobile phone with a digital camera function, the present invention is not limited to this, and can be applied to, for example, a simple mobile phone and a PDA (personal digital assistant) in general. Although the image sensor is applied to a CMOS image sensor, the present invention is not limited to this. For example, the image sensor may be applied to a CCD (charge coupled device) camera.
[0045]
Note that the mobile terminal of the present invention includes a display element that displays an image of an image formed on the image sensor. Thereby, the image obtained by the photographing unit is displayed on the display element in real time. Therefore, when the purpose is not voyeurism, the photographer can take a picture while checking the subject on the display element. As a result, shooting can be performed more easily.
[0046]
In the portable terminal of the present invention, the photographing unit is provided on the surface opposite to the surface on which the display element is provided. Thereby, the display element can be used as a finder. That is, when the purpose is not voyeurism, the photographer can take a picture while checking the subject by the display element. Therefore, photographing can be performed more easily.
[0047]
In the portable terminal of the present invention, the photographing button is provided on the same surface as the display element. Accordingly, since the shooting button is located on the photographer side, camera shake does not occur when shooting.
[0048]
【The invention's effect】
As described above, according to the portable terminal according to the present invention, the key that can be used for shooting changes for each shooting. In other words, shooting is possible only when the numerical value displayed on the display can be input. For this reason, it is difficult to perform continuous shooting without checking the display means. Therefore, it is possible to prevent an antisocial act such as photographing by a malicious user, for example, voyeurism.
[Brief description of the drawings]
1A is a perspective view of a portable terminal according to an embodiment of the present invention, FIG.
FIG. 2 is a block diagram showing a configuration of a mobile terminal according to an embodiment of the present invention.
FIG. 3 is a flowchart showing a flow of processing up to execution and prohibition of photographing according to an embodiment of the present invention.
FIG. 4 is a flowchart showing another processing flow until execution and prohibition of photographing according to an embodiment of the present invention.
FIG. 5 is an optical path diagram of the first example of the optical system used in the mobile terminal according to the embodiment of the present invention.
FIG. 6 is an optical path diagram of a second example of the optical system used in the mobile terminal according to the embodiment of the present invention.
[Explanation of symbols]
1 Mobile phone (mobile terminal)
6 Display (display unit)
12 Built-in lens (shooting unit)
10 Number keys (input unit)
11 Sounder (notification unit)
14 Random number generation circuit (random number generation unit)
18 Memory (image storage unit)

Claims (10)

An imaging unit having an imaging optical system and an imaging device, an image storage unit that stores an image obtained by the imaging unit, an input unit that inputs a number, a random number generation unit that generates a random number, and the image or the A mobile terminal comprising a display unit for displaying numbers, and photographing is executed only when the number displayed on the display unit matches the number input by the input unit. A notification unit that notifies at least one of the first notification information and the second notification information is provided, and the first notification information is information that notifies that the photographing cannot be performed, and the second notification information The mobile terminal according to claim 1, which is information for notifying that the photographing can be executed. The portable terminal according to claim 2, wherein the notification unit includes a sound generating member that generates a predetermined sound. The portable terminal according to claim 2, wherein the notification unit includes a light generation member that generates predetermined light. The mobile terminal according to claim 2, wherein the notification unit includes a vibration generating member that generates a predetermined vibration. The portable terminal according to claim 3, wherein the predetermined sound is different between the first notification information and the second notification information. The portable terminal according to claim 4, wherein the predetermined light is different between the first notification information and the second notification information. The portable terminal according to claim 5, wherein the predetermined vibration is different between the first notification information and the second notification information. The portable terminal according to any one of claims 1 to 8, wherein when the focal length of the imaging optical system is f (mm), the following expression (1) is satisfied.
0.5 <f <10.0 When the F-number of the imaging optical system and the F _no, the mobile terminal according to claims 1, characterized by satisfying the following formula (2) in any one of claims 9.
1.0 <F _no <5.0

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