JP2004363906A - Mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal for preventing a sneak shot and a camera-shake at photographing by the mobile terminal and whose photographing range is not limited when no sneak shot is a photographing object. <P>SOLUTION: The mobile terminal is provided with a built-in camera 12A, shutter keys 5A, 5B, and a processing unit 13 for detecting the simultaneous operation of the shutter keys 5A, 5B and brings the built-in camera 12A into a photographing inhibit state when the processing unit 13 detects no simultaneous operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００３９】

【００４０】
第２の実施形態の携帯端末に用いられる撮像光学系を図７に示す。撮像光学系は、物体側から順に、負屈折力の第１レンズ３１、正屈折力の第２レンズ３２、明るさ絞り３３、正屈折力の第３レンズ３４、第４レンズ３５、フィルタ３６、及び撮像素子３７から構成されている。第１レンズ３１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３２は、物体側に凹面を向けたメニスカスレンズである。第３レンズ３４は、像側に凹面を向けたメニスカスレンズである。第４レンズ３５は、両凸レンズである。
非球面は、第１レンズ３１の像側面、第２レンズ３２の像側面、第４レンズ３５の像側面に用いられている。
【００４１】
この撮像光学系は、全てのレンズがプラスチックで構成されている。このうち、第１レンズ３１、第３レンズ３４、第４レンズ３５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））、第２レンズ３２がポリ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、この撮像光学系のスペックは、焦点距離がｆ＝１．５ｍｍ、ＦナンバーがＦ_ｎｏ＝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。また、物体までの距離は２６０ｍｍである。
【００４２】

【００４３】

【００４４】
上記数値例において、曲率半径及び面間隔の単位はｍｍである。また、ｅ＋００３は、１０^３を表す。
また後述する数値データの表において、ｒは曲率半径、ｄは面間隔を表す。また、ｎは屈折率、νはアッベ数を表し、ｄ線における値である。後述する各光路図には、数値データの表のｒ_ｉ、ｄ_ｉとの対応が示されている。
また、非球面は、以下の定義式で与えられる回転対称非球面である。

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。
【００４５】
各実施形態の撮像光学系において、撮像光学系の焦点距離をｆ（ｍｍ）としたとき、下記の式（１）を満足するのが好ましい。
０．５＜ｆ＜１０．０…式（１）
上記条件を満足すると、撮像光学系の収差の発生を抑えることができ、高性能な撮影ユニットを提供することができる。また、撮影ユニットの全長を短くすることができ、小型な撮影ユニット及び携帯端末を提供することが可能である。
【００４６】
また、撮像光学系のＦナンバーをＦ_ｎｏとしたとき、下記の式（２）を満足するのが好ましい。
１．０＜Ｆ_ｎｏ＜５．０…式（２）
上記条件を満足すると、撮像素子を小型化しても適切な光スポット径が得られるので、回折ボケを防ぐことができる。また、撮像光学系が極端に暗くなることがないので、新たな光源の必要性がない。よって携帯端末の大型化や、電力の消費量の増加を抑えることができる。
また、性能確保のためにレンズの枚数が増加することがないため、撮像光学系の大型化を防ぐことができる。また、焦点深度が浅くなることがないため、撮像光学系の組み立てにおいて、高い組み立て精度の必要性がない。その結果、軽量、低コストで小型な撮影ユニット及び携帯端末を提供することが可能である。
【００４７】
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。

【００４８】
また、撮像光学系を、より高性能で小型にするためには、以下の条件を満足することが好ましい。
１．０＜ｆ＜６．０
更に、高性能で小型にするためには、以下の条件を満足することが好ましい。１．２＜ｆ＜４．８
【００４９】
また、撮像光学系を、より軽量で、低コストで小型にするためには、以下の条件を満足することが好ましい。
１．５＜Ｆ_ｎｏ＜４．２
更に、軽量で、低コストで小型にするためには、以下の条件を満足することが好ましい。
２．０＜Ｆ_ｎｏ＜３．４
【００５０】
また、上記実施の形態では、撮影制御手段となるシャッターキーの配置が、携帯電話機の正面部にのみ配置されたが、側面部や背面部に配置されるように構成されてもよい。
また、上記実施の形態では、撮影制御手段として独立したシャッターキーで構成されたが、例えば、数字キーによって構成されてもよい。
【００５１】
また、上記実施形態では、報知ユニットとしてサウンダ１０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。
【００５２】
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。
【００５３】
また、上記実施の形態では、携帯電話機本体が、矩筒形の折りたたみ式、または矩筒形の一胴体で構成されていたが、２つの導体をスライド式にした携帯電話機としてもよい。
また、上記実施の形態では、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の携帯電話機を用いたが、動画像が撮像可能なものに適用してもよい。
また、上記実施の形態では、デジタルカメラ機能付の携帯電話機を用いたが、例えば、ＰＨＳや、携帯情報端末全般に適用してもよい。
【００５４】
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。
【００５５】
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。
【００５６】
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。
【００５７】
【発明の効果】
以上説明したように、請求項１に係る発明によれば、少なくとも２つあり、片手で操作できないような位置に設けられている撮影ボタンを同時に操作されない場合に、撮像手段による撮像を禁止した。そのため、悪意の使用者による盗撮等の反社会的行為を防止することができる。また、同時に操作されたことが検出されれば撮影が行われるので、撮影範囲が限定されない。また、両手で操作するため、手ぶれを防ぐことができる。更に、小型で操作性の良い、携帯端末を提供できる。
【図面の簡単な説明】
【図１】本発明の第１実施形態として示した携帯端末の構成図であり、（ａ）は内面側からの斜視図であり、（ｂ）は外面側からの斜視図である。
【図２】本発明の第１実施形態における、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３】様々な撮影の様子を示す図であり、（ａ）は水平方向の被写体を撮影する様子、（ｂ）と（ｃ）垂直方向の被写体を撮影する様子である。
【図４】本発明の第２実施形態として示した携帯端末の構成図であり、（ａ）は内面側からの斜視図であり、（ｂ）は外面側からの斜視図である。
【図５】本発明の第２実施形態における、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６】本発明の第１実施形態に係る携帯端末に用いられる撮像光学系の光路図である。
【図７】本発明の第２実施形態に係る携帯端末に用いられる撮像光学系の光路図である。
【符号の説明】
１ 携帯電話機（携帯端末）
５Ａ、５Ｂ、５Ｃ シャッターキー（撮影ボタン）
７ ディスプレイ（表示手段）
１０ サウンダ（報知ユニット）
１２ 内蔵カメラ（撮影ユニット）
１３ 処理ユニット
１４ 操作検出回路（操作検出ユニット）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mobile terminal having a camera function and a voyeur prevention function.
[0002]
[Prior art]
2. Description of the Related Art In recent years, mobile phones and personal digital assistants provided with a digital camera function (hereinafter, abbreviated as a camera function) have been supplied. For example, a mobile phone with a camera function can easily shoot a subject (a shooting target) simply by pointing the camera at the shooting target and pressing a shooting button. At this time, the image of the subject is obtained as a still image or a moving image (hereinafter, simply referred to as an image).
Then, the obtained image is stored in the memory as image data. Further, it can be attached to an e-mail and transmitted, or displayed as a standby screen or an incoming call screen. Further, unnecessary image data can be easily deleted from the memory.
However, taking advantage of this convenience, it is expected that malicious users who perform anti-social actions such as voyeurism, such as taking pictures from a low position inside a train or the like, may appear. In addition, since voyeur image data can be easily deleted, there is a problem that it does not remain as evidence of malicious intent.
Therefore, for example, as described in Patent Document 1 below, a portable terminal that prevents voyeurism has been proposed.
[0003]
[Patent Document 1]
JP-A-2002-290818 (page 5, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, the above-mentioned conventional anti-voyeur portable terminal prohibits photographing when the portable terminal body is tilted within the range of the photographing prohibition angle. Therefore, even in the case where the purpose of the voyeur shooting is not intended, the shooting is prohibited if it is within the range of the shooting prohibited angle. As a result, there is a problem that the photographing range is significantly limited.
[0005]
The present invention has been made in view of the above-described circumstances, and has as its object to provide a portable terminal in which voyeur shooting is difficult. It is another object of the present invention to provide a portable terminal that does not limit the photographing range when photographing is not intended for voyeur photography. It is another object of the present invention to provide a small-sized mobile terminal with good operability.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention proposes the following means.
The invention according to claim 1 includes an imaging unit having an imaging optical system and an imaging element, two or more imaging buttons, and an operation detection unit that detects that the imaging buttons are simultaneously operated. Proposes a mobile terminal that executes shooting only when a simultaneous operation is detected.
[0007]
According to the present invention, two or more photographing buttons are provided at positions where operation with one hand is not possible. Then, the photographing driving buttons are simultaneously operated, and the photographing is executed only when the simultaneous operation is detected by the operation detecting unit. That is, if the simultaneous operation is not detected, the photographing is not performed. For this reason, it is difficult to perform shooting with one hand. As a result, it is possible to prevent a voyeurism or the like of taking a picture instantaneously while moving so as not to be noticed from the surroundings. In addition, since the photographing button must be operated with both hands, an unnatural posture is maintained for the purpose of voyeurism. That is, the attitude of the photographer's intention of voyeurization comes to the surface by the posture. Therefore, it leads to prevention of voyeurism.
In the case where the purpose of the voyeur shooting is not intended, if the shooting button can be operated with both hands, shooting can be performed regardless of the state of the mobile terminal. Therefore, the photographing range is not limited. In addition, since the mobile terminal can be securely fixed by holding the mobile terminal with both hands, camera shake can be prevented.
[0008]
According to a second aspect of the present invention, in the portable terminal according to the first aspect, the mobile terminal further includes a notification unit having at least one of first notification information and second notification information, wherein the first notification information is the photographing information. The portable terminal is information that notifies that the photographing cannot be performed, and the second notification information is information that reports that the photographing can be performed.
According to a third aspect of the present invention, there is provided the mobile terminal according to the second aspect, 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 mobile terminal according to the second aspect, wherein the notification unit includes a sound generating member that generates a predetermined sound.
According to a fifth aspect of the present invention, there is provided the mobile terminal according to the second aspect, 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, it is possible to prevent the voyeur using the notification information. Further, it is possible to notify the photographer that the photographing cannot be performed (imaging prohibited state).
In addition, when the notification unit has the second notification information, the second notification information can notify the photographer that the photographing can be performed (capturable state).
[0009]
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 notification information and the second notification information.
The invention according to claim 8 provides a portable terminal in which the predetermined vibration differs between the first notification information and the second notification information.
According to these inventions, it is possible to distinguish whether the first notification information has been notified or the second notification information has been notified.
[0010]
The invention according to claim 9 proposes a mobile terminal that satisfies the following expression (1) when the focal length of the imaging optical system is f (mm).
0.5 <f <10.0 ... Equation (1)
ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the aberration of an imaging optical system can be suppressed and a high-performance imaging unit can be provided. Further, the overall length of the imaging unit can be reduced, and a small imaging unit and a portable terminal can be provided.
[0011]
The invention according to claim 10 proposes a mobile terminal that satisfies the following expression (2) when an F number of the imaging optical system is F _no .
1.0 <F _no <5.0 Expression (2)
According to the present invention, an appropriate light spot diameter can be obtained even if the imaging device is downsized, so that diffraction blur can be prevented. Further, 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.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a mobile terminal according to the present invention will be described with reference to FIGS. The embodiment described here is applied to a mobile phone.
FIG. 1 shows a mobile terminal according to the first embodiment. As shown in FIG. 1, the mobile phone 1 according to this embodiment is configured as a folding mobile phone. In this configuration, the second housing 2B is foldably connected to the first housing 2A via the hinge 3.
[0013]
The first housing 2A is provided with an operation key unit 4 composed of numeric keys and the like, a shutter key (shooting button) 5A, and a microphone 6 for inputting a transmission voice on the inner side when folded. ing. The shutter key 5A is arranged at the lower left corner of the housing 2A.
On the inner surface side of the second housing 2B, a shutter key 5B, a display (display unit) 7 for displaying characters and images, and a speaker 8 for outputting a received voice are provided. Further, a light emitting diode (LED) 9 for notifying an incoming call or a charging state is provided in the vicinity thereof. A sounder 10 is provided on the outer surface. Here, the sounder 10 includes a sound generating member (sound source) that outputs a ringtone or a warning sound, and functions as a notification unit. The shutter key 5B is arranged at the upper right corner of the housing 2B.
In addition, an antenna 11 that can freely appear and disappear is provided at the upper end.
[0014]
The second housing 2B is provided with a built-in camera (photographing unit) 12 used for photographing. The built-in camera 12 has an imaging optical system and an imaging device. This imaging optical system will be described later.
Further, a processing unit 13 is provided inside the second housing 2B. The processing unit 13 includes a microcomputer, a memory, and the like. The built-in camera 12 and an operation detection circuit (operation detection unit) 14 are connected to the processing unit 13. When the shutter keys 5A and 5B are operated, the operation detection circuit (operation detection unit) 14 detects the operation state.
[0015]
Next, a method of using the mobile phone 1 of the present embodiment will be described. First, the first housing 2A and the second housing 2B are expanded, and the power is turned on by operating keys as appropriate. When used as a telephone, call operation is performed in this state. When the process proceeds to the call processing, the sound signal input to the microphone 6 is transmitted from the antenna 11 as sound data by a call processing circuit (not shown). Further, the voice data received from the antenna 11 by the call processing circuit is output from the speaker 8 as a voice signal. Thus, it is used as a telephone.
[0016]
Next, a method of using the mobile phone 1 as a camera will be described with reference to FIGS. FIG. 2 is a flowchart showing the flow of processing up to the execution and prohibition of shooting. FIG. 3 shows a photographer.
First, the first housing 2A and the second housing 2B are expanded similarly to the use as the telephone described above. Then, the power is turned on by appropriately operating a key, and a predetermined operation is performed using the operation key unit 4, thereby setting a photographing mode in which photographing is possible (step S1).
Next, the photographer points the built-in camera 12 at a subject to be photographed. When the built-in camera 12 is pointed at the subject, an image captured by the built-in camera 12 is displayed on the display 7. The photographer confirms the subject to be photographed on the image displayed on the display 7. Then, when the subject can be confirmed, shooting is performed. This is started by pressing the shutter keys 5A, 5B.
[0017]
When detecting that the shutter keys 5A and 5B have been pressed (step S2), the processing unit 13 stores the data of the image displayed on the display 7 in the memory (step S3). Information on pressing the shutter keys 5A and 5B (hereinafter referred to as pressing information) is transmitted to the operation detection circuit 14. Therefore, the operation detection circuit 14 can also detect that the shutter keys 5A and 5B are pressed.
The press information transmitted to the operation detection circuit 14 is independent of the shutter keys 5A and 5B. Here, the operation detection circuit 14 includes, for example, a clock generation circuit and a count circuit for counting clocks. The clock is counted until an interrupt is generated by the press information. Thus, a count value A when the shutter key 5A is pressed and a count value B when the shutter key 5A is pressed are obtained (step S4).
[0018]
Next, the obtained count values are sent from the operation detection circuit 14 to the processing unit 13. The processing unit 13 compares the count value A with the count value B (step S5). Here, when the count value A and the count value B are the same, the processing unit 13 permits photographing. In this case, the image data stored in the memory is stored as it is. Thereafter, the state returns to a state in which shooting is possible, but the shooting mode is ended by performing a predetermined operation with the operation key unit 5 (step S6).
[0019]
On the other hand, if the count value A and the count value B are different, the processing unit 13 prohibits the processing unit 13 from photographing. In this case, for example, the image data stored in the memory is deleted (discarded) (step S7). Thus, the photographing has not been performed. Thereafter, the state returns to a state in which shooting is possible, but the shooting mode is ended by performing a predetermined operation with the operation key unit 5 (step S6).
[0020]
According to the above configuration, shooting is performed only when the shutter keys 5A and 5B are pressed simultaneously. At this time, the shutter keys 5A and 5B are arranged at positions where they cannot be pressed with one hand. Here, shooting with one hand, such as the shooting state in FIG. 3C, is often used for voyeur shooting. However, according to the above configuration, such a shooting state cannot be taken. Therefore, the voyeur cannot be performed in the photographing state of FIG.
In addition, if the user tries to execute shooting and the shooting state is as shown in FIG. 3B, the posture becomes unnatural. Therefore, the photographing action is easily recognized visually by the surrounding people. Therefore, voyeurism can be prevented.
[0021]
In the case where the voyeur is not intended, the mobile phone can be held with both hands as shown in FIG. Therefore, the shutter keys 5A and 5B can be easily and simultaneously pressed. As a result, shooting is performed. The shooting state at that time also becomes a natural shooting state as shown in FIG. Therefore, there is no fear of misunderstanding. In addition, by taking a posture that can be operated with both hands, it is possible to perform photographing without limiting the photographing range. In addition, since the mobile phone is held with both hands, a posture free of camera shake is established. Therefore, it also leads to prevention of failure in photographing due to camera shake.
[0022]
In this embodiment, by using the display 7 as a finder, it is possible to shoot while confirming the subject. Further, since the shutter key 4 is provided on the same surface as the display 7, the photographing becomes easier.
Further, when “YES” is determined in step S5, or when the process of step S7 ends, it is preferable to notify that the process has ended.
[0023]
Next, a mobile terminal according to a second embodiment is shown in FIG. The second embodiment has the same basic configuration as the above-described first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIG. 4, the second embodiment further includes a shutter key 5C. That is, the shutter key 5A is arranged at the lower left corner, the shutter key 5B is arranged at the upper right corner, and the shutter key 5C is arranged at the upper left corner.
Also in the present embodiment, the built-in camera 12 includes an imaging optical system and an imaging device. This imaging optical system will be described later.
[0024]
Next, a photographing method using the anti-voyeur portable terminal of the present embodiment will be described. FIG. 5 is a flowchart showing the flow of processing up to the execution and prohibition of shooting.
In the first embodiment, when the press of the shutter keys 5A and 5B is detected, the image data is stored. However, the image data need not be stored as in the present embodiment.
First, similarly to the first embodiment, the shooting mode is set (step S1), and the built-in camera 12 is pointed at the subject. In this state, an image obtained by the built-in camera 12A is displayed on the display 7. In the present embodiment, three shutter keys 5A, 5B, and 5C are provided. Therefore, by pressing the three shutter keys 5A, 5B, and 5C simultaneously, shooting starts.
[0025]
The processing unit 13 detects that the shutter keys 5A, 5B, and 5C have been pressed (step S2). Note that information on pressing the shutter keys 5A and 5B is transmitted to the operation detection circuit 14. Therefore, the operation detection circuit 14 can also detect that the shutter keys 5A and 5B are pressed.
The operation detection circuit 14 obtains a count value A when the shutter key 5A is pressed, a count value B when the shutter key 5A is pressed, and a count value C when the shutter key 5C is pressed (step S1). S3). When each count value is obtained, the processing unit 13 compares the count value A, the count value B, and the count value C (Step S4).
[0026]
Here, when the values of the count value A, the count value B, and the count value C are the same, the processing unit 13 performs photographing. In this case, the image data (image data obtained by the built-in camera 12) displayed on the display 7 is stored (step S5). Thus, the photographing has been executed. Thereafter, the state returns to a state in which shooting is possible, but the shooting mode is ended by performing a predetermined operation with the operation key unit 5 (step S6).
[0027]
On the other hand, when the count values A, B, and C are not the same, the processing unit 13 does not execute photographing. In this case, the image data displayed on the display 7 is not stored. Thus, the photographing has not been performed. Further, a warning sound is generated (step S7). Thereafter, the state returns to a state in which shooting is possible, but the shooting mode is ended by performing a predetermined operation with the operation key unit 5 (step S6).
[0028]
According to the above configuration, the same effect as in the first embodiment can be obtained. In addition, since the shutter keys 5A, 5B, and 5C are simultaneously operated with both hands, the mobile phone 1 can be securely fixed, and camera shake can be prevented.
[0029]
In the present embodiment, when the photographing is not performed (step S7), the sounder 10 emits a warning sound. Therefore, the photographer can easily recognize that the photographing has not been performed. In addition, since the warning sound can be heard by the surrounding people, there is also an effect of notifying the surrounding people.
Further, when the photographing is performed (step S5), a sound different from the warning sound may be generated. Then, the photographer can recognize that the photographing has been performed.
[0030]
Further, by using the display 7 as a finder, it is possible to shoot while confirming the subject. At this time, since the shutter key 4 is provided on the same surface as the display 7, the photographing becomes easier.
[0031]
As described above, it is preferable that at least one of the two pieces of notification information be notified by the sounder 10. One is information (first notification information) that notifies that shooting cannot be performed. Another type is information (second notification information) that notifies that shooting can be performed or that shooting has been completed.
In the present embodiment, the first notification information is output from the sounder 10 as sound. In this case, as described above, it is possible to cause surrounding people to recognize that shooting is about to be performed or that shooting has been performed. Therefore, it is easier to prevent voyeurism. It is also assumed that the second notification information is output from the sounder 11 as sound. In this case, the photographer can recognize that the photographing is completed. Therefore, the photographer can move on to the next photographing.
In addition, it is preferable to adopt such a configuration also in other embodiments.
[0032]
When two or more pieces of notification information are output, it is preferable that the volume, range, sounding time, and the like be different for each piece of notification information. As described above, light or vibration may be used instead of sound. In this case, it is preferable that the intensity and frequency of light and vibration, the light emission time and the vibration time, and the like be different for each notification information.
[0033]
In the present embodiment, the image data is not stored when the shutter keys 5A, 5B, and 5C are pressed. However, it goes without saying that image data may be stored as in the first embodiment.
Further, in both the present embodiment and the first embodiment, shooting can be executed only when the count value is the same. However, it is difficult to press a plurality of shutter keys at the same time. Therefore, a predetermined allowable range may be provided, and photographing may be performed if the difference between the count values is within the allowable range.
[0034]
The technical scope of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the display means is simply a display. However, a color liquid crystal display device, a digital micromirror device (DMD), an organic EL display device, or a plasma display panel (PDP) is used. It may be configured.
[0035]
Further, in the above-described embodiment, the imaging means is simply a built-in camera, but may be constituted by a CCD (charge coupled device) or a C-MOS artificial retinal IC. In addition, when the lens is disposed in a place where the thickness is not large, such as a mobile phone, it is preferable that the lens configuration be a telephoto type so that the focal length can be longer than the entire length of the lens.
[0036]
Next, an imaging optical system used in each embodiment will be described below.
FIG. 6 shows an imaging optical system used in the mobile terminal according to the first embodiment. The imaging optical system includes, in order from the object side, a first lens 21 having a positive refractive power, a brightness stop 22, a second lens 23 having a negative refractive power, a third lens 24 having a positive refractive power, a filter 25, and an image sensor 26. It is configured. This is a so-called triplet optical power arrangement. The first lens 21 is convex toward the object side. The second lens 23 is a meniscus lens convex toward the image side.
The aspheric surfaces are provided on both surfaces of the first lens 21, both surfaces of the second lens 23, and both surfaces of the third lens 24.
[0037]
In this imaging optical system, the first lens 21 is made of glass, and the second lens 23 and the third lens 24 are made of plastic. The plastics used are polycarbonate and polyolefin-based plastics (for example, ZEONEX (registered trademark)), respectively.
The specifications of this imaging optical system are a wide-angle optical system having a focal length of f = 4.5 mm, an F-number of F _no = 2.4, and a total angle of view of 67 °. The total length of the optical system is a very small value of 6.2 mm. The distance to the object is ∞.
[0038]

[0039]

[0040]
FIG. 7 shows an imaging optical system used in the mobile terminal according to the second embodiment. The imaging optical system includes, in order from the object side, a first lens 31 having a negative refractive power, a second lens 32 having a positive refractive power, a brightness stop 33, a third lens 34 having a positive refractive power, a fourth lens 35, a filter 36, And an imaging element 37. The first lens 31 is a meniscus lens having a concave surface facing the object side. The second lens 32 is a meniscus lens having a concave surface facing the object side. The third lens 34 is a meniscus lens having a concave surface facing the image side. The fourth lens 35 is a biconvex lens.
The aspheric surface is used for the image side surface of the first lens 31, the image side surface of the second lens 32, and the image side surface of the fourth lens 35.
[0041]
In this imaging optical system, all lenses are made of plastic. Among them, the first lens 31, the third lens 34, and the fourth lens 35 are polyolefin-based plastic (for example, ZEONEX (registered trademark)), and the second lens 32 is a polystyrene-based plastic (for example, styrene (registered trademark)). It is.
The specifications of the imaging optical system are a wide-angle optical system having a focal length of f = 1.5 mm, an F-number of F _no = 3.0, and a total angle of view of 66 °. The total length of the optical system is a very small value of 6.3 mm. The distance to the object is 260 mm.
[0042]

[0043]

[0044]
In the above numerical examples, the units of the radius of curvature and the surface interval are mm. Moreover, e + 003 represent 10 ^3.
In the numerical data table described later, r represents a radius of curvature, and d represents a surface interval. Further, n represents a refractive index, ν represents an Abbe number, and is a value at the d-line. Each of the optical path diagrams described later shows the correspondence between r _i and d _{i in} the table of numerical data.
The aspheric surface is a rotationally symmetric aspheric surface given by the following definition expression.

Here, Z is an optical axis (on-axis principal ray) where the traveling direction of light is positive, and y is a direction perpendicular to the optical axis. Here, R is a paraxial radius of curvature, k is a conic constant, and a, b, c, d,... Are fourth-order, sixth-order, eighth-order, and tenth-order aspherical coefficients, respectively. The Z axis of this definition expression is the axis of the rotationally symmetric aspherical surface. Note that a term relating to an aspheric surface for which no data is described is zero.
[0045]
In the imaging optical system of each embodiment, when the focal length of the imaging optical system is f (mm), it is preferable that the following expression (1) is satisfied.
0.5 <f <10.0 ... Equation (1)
When the above condition is satisfied, the occurrence of aberration of the imaging optical system can be suppressed, and a high-performance imaging unit can be provided. Further, the overall length of the imaging unit can be reduced, and a small imaging unit and a portable terminal can be provided.
[0046]
When the F number of the imaging optical system is F _no , it is preferable that the following expression (2) is satisfied.
1.0 <F _no <5.0 Expression (2)
When the above condition is satisfied, an appropriate light spot diameter can be obtained even if the image pickup device is downsized, so that diffraction blur can be prevented. Further, 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 for ensuring performance, it is possible to prevent the imaging optical system from becoming large. Further, since the depth of focus does not become shallow, there is no need for high assembly accuracy in assembling the imaging optical system. As a result, it is possible to provide a small, light-weight, low-cost photographing unit and a portable terminal.
[0047]
The imaging optical system of each embodiment satisfies the conditions as described below.

[0048]
In order to make the imaging optical system more compact with higher performance, it is preferable to satisfy the following conditions.
1.0 <f <6.0
Further, in order to achieve high performance and small size, it is preferable to satisfy the following conditions. 1.2 <f <4.8
[0049]
In order to make the imaging optical system lighter, lower in cost, and smaller, it is preferable that the following conditions are satisfied.
1.5 <F _no <4.2
Further, in order to reduce the weight, cost, and size, it is preferable to satisfy the following conditions.
2.0 <F _no <3.4
[0050]
Further, in the above embodiment, the shutter key serving as the photographing control unit is arranged only on the front part of the mobile phone, but it may be arranged on the side part or the back part.
Further, in the above embodiment, the photographing control means is constituted by an independent shutter key, but may be constituted by a numeric key, for example.
[0051]
In the above embodiment, the sounder 10 is used as the notification unit. However, the present invention is not limited to this. The light emitting member, for example, the LED 3 may also be used as the notification unit. Using this light emitting member, the first notification information and the second notification information can be transmitted. Further, the mobile phone 1 may be provided with a new LED or the like as a light emitting member. Further, flash light can 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 the photographing is about to be performed.
Further, the mobile phone 1 is provided with a vibrator function (vibrating member) for notifying an incoming call. In this case, it may be used also as the notification unit. The first notification information and the second notification information can be transmitted using this vibration member. Further, the mobile phone may be provided with a new vibration generating member as a notification unit.
[0052]
The notification by the sound generating member, the light emitting member, and the vibration generating member may be combined and configured according to the application. And even with such a configuration, the same effect as when the notification unit as in the present embodiment is configured by the sound generating member can be obtained.
[0053]
Further, in the above-described embodiment, the mobile phone main body is formed of a rectangular-tube-shaped folding type or a rectangular-tube-shaped single body, but may be a mobile phone in which two conductors are slid.
Further, in the above embodiment, the mobile terminal is a mobile phone with a digital camera function capable of capturing a still image, but may be applied to a mobile terminal capable of capturing a moving image.
Further, in the above-described embodiment, a mobile phone with a digital camera function is used, but the present invention may be applied to, for example, a PHS or a mobile information terminal in general.
[0054]
Note that the mobile terminal of the present invention includes a display element for displaying 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 a voyeur is not intended, the photographer can perform photographing while checking the subject with the display element. As a result, shooting can be performed more easily.
[0055]
Further, in the portable terminal of the present invention, the imaging unit is provided on the surface opposite to the surface on which the display element is provided. This makes it possible to use the display element as a finder. That is, when the purpose of voyeur shooting is not intended, the display device allows the photographer to shoot while checking the subject. Therefore, shooting can be performed more easily.
[0056]
In the mobile terminal of the present invention, the shooting button is provided on the same surface as the display element. Accordingly, since the photographing button is located on the photographer side, camera shake does not occur when photographing.
[0057]
【The invention's effect】
As described above, according to the first aspect of the present invention, when at least two photographing buttons provided at positions that cannot be operated with one hand are not operated at the same time, the imaging by the imaging unit is prohibited. Therefore, it is possible to prevent anti-social actions such as voyeurism by a malicious user. Further, if the simultaneous operation is detected, the photographing is performed, so that the photographing range is not limited. In addition, since the operation is performed with both hands, camera shake can be prevented. Furthermore, a portable terminal which is small and has good operability can be provided.
[Brief description of the drawings]
FIGS. 1A and 1B are configuration diagrams of a portable terminal shown as a first embodiment of the present invention, wherein FIG. 1A is a perspective view from an inner surface side, and FIG. 1B is a perspective view from an outer surface side.
FIG. 2 is a flowchart showing a flow of processing up to execution and prohibition of photographing in the first embodiment of the present invention.
FIGS. 3A and 3B are diagrams illustrating various photographing states, in which FIG. 3A illustrates a state of photographing a horizontal subject, and FIGS. 3B and 3C illustrate a state of photographing a vertical object.
FIGS. 4A and 4B are configuration diagrams of a portable terminal shown as a second embodiment of the present invention, wherein FIG. 4A is a perspective view from the inside, and FIG. 4B is a perspective view from the outside.
FIG. 5 is a flowchart showing a flow of processing up to execution and prohibition of photographing in a second embodiment of the present invention.
FIG. 6 is an optical path diagram of an imaging optical system used in the mobile terminal according to the first embodiment of the present invention.
FIG. 7 is an optical path diagram of an imaging optical system used in a mobile terminal according to a second embodiment of the present invention.
[Explanation of symbols]
1 mobile phone (mobile terminal)
5A, 5B, 5C Shutter key (shooting button)
7. Display (display means)
10. Sounder (notification unit)
12 Built-in camera (shooting unit)
13 processing unit 14 operation detection circuit (operation detection unit)

Claims (10)

An imaging unit having an imaging optical system and an imaging element, two or more imaging buttons, and an operation detection unit for detecting that the imaging buttons are simultaneously operated, and only when simultaneous operation is detected by the operation detection unit , A mobile terminal that performs shooting. A notification unit for notifying at least one of the first notification information and the second notification information, wherein the first notification information is information for notifying that the photographing cannot be performed, and the second notification information is provided. The mobile terminal according to claim 1, wherein the information is information that notifies that the shooting has been completed. The mobile terminal according to claim 2, wherein the notification unit includes a sound generating member that generates a predetermined sound. The mobile terminal according to claim 2, wherein the notification unit includes a light emitting member that emits predetermined light. The mobile terminal according to claim 2, wherein the notification unit includes a vibration generating member that generates a predetermined vibration. The mobile terminal according to claim 3, wherein the predetermined sound is different between the first notification information and the second notification information. The mobile terminal according to claim 4, wherein the predetermined light is different between the first notification information and the second notification information. The mobile terminal according to claim 5, wherein the predetermined vibration is different between the first notification information and the second notification information. The mobile terminal according to any one of claims 1 to 8, wherein the following formula (1) is satisfied when a focal length of the imaging optical system is f (mm).
0.5 <f <10.0 ... Equation (1) The mobile terminal according to claim 1, wherein the following formula (2) is satisfied when an F number of the imaging optical system is F _no : 10.
1.0 <F _no <5.0 Expression (2)

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