TW200527118A - Camera and method for setting exposure condition of the same - Google Patents

Abstract

A film-loading type camera comprises an exposure setting unit setting an exposure condition. The exposure setting unit carries out an exposure compensation of not less than +1.5 EV for a photometric value when the camera is loaded with a film of a film speed with which a system sensitivity defined as Ls in the following equation is not more than a specific value: Ls=5-log2 (S/3.125)-log2 T0 +2.log2 F0. In the equation, S is an arithmetic expression of the ISO speed of the loaded film, F0 is an f-number at full opening of the camera lens, and T0 is a maximum shutter speed in second.

Description

200527118 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a film-filled camera for automatically setting exposure conditions and a method for setting exposure conditions of the camera. [Prior art] The exposure conditions can be set automatically as soon as a negative film is loaded, and a photo can be taken appropriately by pressing the shutter. Cameras with the above-mentioned fully automatic functions have become very popular. This type of camera can not only automatically control exposure, but also focus control and auxiliary light control. Anyone can take a picture as long as the power is turned on and the shutter is pressed. Even when the subject is dark indoors or at night, the cymbal magnesium will automatically emit light, allowing the main subject to be properly exposed. Although the town light is as described above, it can be taken in any environment, but it has the following problems: Compared with the main subject, the light of the back light cannot reach the background and appears dim.

• The light on the main subject is a non-existent feeling. The light is unnatural — for these reasons, the photos taken cannot feel the original atmosphere. Although some cameras can shoot without having to turn on the magnesium light, the photos of the camera and the camera have the following disadvantages: Qi Jie ^ White shots will therefore be issued when the photographer is shooting. The problem. • Underexposed people. • Taking pictures under the lamp will turn yellow. • Each time you turn on the power, you must set the magnesium light to not emit light.

TW2159PA 5 2Θ0527118 In Japanese Patent Application Laid-Open No. 5 3 4 7 5 4 (Patent Document Engineering) _, although an invention is disclosed, that is, when the subject is below a certain brightness value, the camera sighs that the film sensitivity is low. When using a low-sensitivity film, the sensitivity of the system becomes low, which causes the problem of "hand blur", which is very inconvenient for users who want to take pictures easily. [Summary of the Invention] The purpose of the invention is to provide a kind of negative film loading reed camera that does not cause the above-mentioned disadvantages to occur even if auxiliary lights such as a button are not used. The film-loaded camera of the present invention has an exposure setting section for correcting the exposure. The exposure setting section uses the I SO sensitivity value S of the loaded film, the F-number FQ of the open aperture of the camera, and the shutter opening of the camera The upper limit of time 値 T.计算 When the calculation result of the common phase m ° degree L s below is lower than a specific L, the exposure δ and the exposure condition setting of the fixed part will set the metering to the correct exposure + 1 · 5 Ε V or more. The formula is Ls = 5-log2 (S / 3.125)-10g2TG + 2.1〇g2F. With the present invention, even if auxiliary light such as a magnesium lamp is not used, the subject can be photographed naturally and completely, and a photograph that can convey the atmosphere of the scene can be taken. In addition, the present invention: ^ The aforementioned exposure setting section of the film-loading camera can perform the aforementioned corrected exposure only when the metering range is lower than the special range. With such a structure, it is not easy for the subject to be underexposed due to the influence of the surrounding brightness (for example, the subject being illuminated). I. The above-mentioned exposure setting section of the film loading camera of the moon and the moon can also perform the above-mentioned corrected exposure only when it encounters the negative film with the system sensitivity U4 or lower of the system description. Exposure. In addition, the aforementioned exposure setting section of the film-filled camera of the present invention may be limited to

TW2159PA 6 200527118 The upper limit of the shutter opening time ^ structure can reduce the rattling noise caused by hand shake = above. With this addition, if the aforementioned exposure setting unit comes from μ τ and σ, the upper limit of the shutter opening time (T0) can also be described, and the upper limit of the shutter opening V ψ, + ... can be set to 1/30. [Seconds] Calculate that the system sensitivity Ls is described. Now, we have the following structures: z 丄 # 快 n 、 # _, ^ The same structure, even if no hand shake limit door speed is set, the effect of hand shake on the photography effect is low. In addition, the aforementioned exposure setting section is a photometric section for measuring a photographic field of view, a film sensitivity sensing section that senses 4 degrees of residual sound of the loaded negative film, a measurement signal input by the photometric section, and the aforementioned sensitized sensor section. The input sensor signal is calculated based on the system sensitivity Ls. At the same time, the pre-exposure condition of the umbrella warmer is set. In addition, it can be equipped with a control unit that controls the shutter opening operation. «The exposure setting section can also set the auxiliary light not to emit light when setting the aforementioned exposure conditions. With such a structure, the subject can reduce the unnatural impression. The present invention can also describe a method for setting exposure conditions for a film-filled camera having the same effect. Specifically, the exposure button setting method of the present invention is to 'use a photometric section for measuring the external brightness in the photographic field of view, an ISO expression of the ISO sensitivity of the loaded negative S, and an F value F of the camera's open aperture. And the shutter opening time limit of the aforementioned camera is 値 T. The calculated sensitivity Ls is calculated by the following formula. When the current system sensitivity Ls is below a certain value, the metering will be corrected by + 1 · 5 E V or more. Formula: LsMqogdsAuspiogjQ + s ic ^ F. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings for detailed description as follows: [Embodiment] The camera of the present invention and the camera The exposure condition setting method allows even photographers who do not know special knowledge to take photos that can reflect the atmosphere of the scene in a dark and night environment without using auxiliary light such as a magnesium lamp. An embodiment of the present invention will be described in detail with reference to the following drawings. In the description of the drawings, the same reference numerals are used for the same elements, and duplicate descriptions are omitted here. In addition, the present invention is not limited to this as the only embodiment. First Embodiment Please refer to FIGS. 1 and 2. Fig. 1 is a perspective view showing the front appearance of a camera according to a first embodiment of the present invention. Fig. 2 is a perspective view showing the appearance of the back side of the camera in the embodiment. As shown in Fig. 1, the camera of this embodiment is a lens-shutter camera suitable for loading a 135 film format. This camera is provided with an open shutter button u on the upper end of the body 10. A lens body with a photographic lens 12 is mounted in the center of the front of the camera body 10 > In this lens body 13, an auto-focusing lens composed of a single focus lens with a focal length of 24 mm and an open aperture of F2 〇 is used. Photography lens body. Above the camera body 10, a light projection section 14, a viewing window 15, a light receiving section 16 and a magnesium lamp 17 are provided. The light-emitting section 14 and the light-receiving section 16 are distance measuring sections that measure the distance to the subject based on the principle of triangulation.

A camera body 18 is further provided with a photometric section 18. The photometric section 18 has a function of measuring the photointensity inside and outside the photographic field. The photometric section 18 uses, for example, a SPD element of a central focus average photometric sensor (a built-in το element of an isolated infrared filter is built into the optical path). The SPD element is suitable for use on the optical axis of an approximate photographic lens optical system. A shutter shaft is mounted on the optical axis of the photographic lens 12 inside the camera body H). Fast: 19 structure has a size control and parts for adjusting the exposure required for negatives. The shutter has, for example, an f-number of ⑽ f / 2 Q) when it is opened, and a system-type lens shutter surrounded by EV2 to 16 [EV]. As shown in FIG. 2, the camera body 104 and the warning light emitting section 42 are provided. Warning light-emitting part Eyepiece window with a viewing window at the upper part of the back 42 Red and green light-emitting elements can be used

TW2159PA 8 2G0527118 sub. An inner cover 43 is installed below the viewfinder eyelet window 41 and the warning light emitting section 42. As long as the inner cover 43 'is opened, the negative film can be loaded into the camera body 10. There is a battery cover 44 next to the inner cover 43. The battery cover 44 can be opened in the camera body 10 by opening the battery cover 44. The inner cover 43 is provided with a main button 45, a function switch 46, a date switch 47, and a display section 50. The main switch 45 is a switch for turning on the overall power of the camera. The function switch 46 is a switch for switching the function of the camera. The date switch 47 is a switch used for setting and correcting the date. The display section 50 displays the camera function, the date, and the number of remaining films. The display portion 50 can be displayed using an LCD. βmonth > Fig. 3 is an enlarged view of the display portion 50. As shown in FIG. 3, the display section 50 is provided with a camera function display section 5b, a date display section 52, and a photographic number display section 53. The part where the camera function display section 51 displays the camera function can be set with an automatic photographing mark 51a, a magnesium lamp photographing mark 51b, a light lock prohibition mark 51c, and a natural light photographing mark 51d. The date display unit 52 displays the date. The number-of-photographs display section 53 displays the number of remaining films. In addition, the display unit 50 in FIG. 3 can display all the symbols. When the camera is used, 'it will display the camera function, date and number of negatives. Please refer to FIG. 4, which is a schematic block diagram of the electrical structure of the camera of this embodiment. = 4 As shown in the figure, the camera of this embodiment has a control unit 20. The control unit controls the Yutai camera ’, for example, by a CPU, ROM, RAM, input signal circuit, output signal circuit, and the like. The control department 2G stores control program programs. In addition, the processing of Na 2G is expected to be processed, and the Yang data used in the processing. In addition, at least two of the cameras in this embodiment are: == two-piece sensitivity sensor section 65, and the control section 2 ° is the minimum required element for setting the pre-exposure conditions after setting. ^ The control section 20 is connected to the display section 50. According to the control signal input from the control unit 20, the display unit 50 will display the camera's camera completion date, date, and remaining balance.

TW2159PA 9 200527118 pieces and so on. The control section 20 is also connected to a main button 45, a function button 46, and a date button 47. The control unit 20 turns on and off the camera power when it receives a signal input from the main button 45. When the control unit 20 receives a signal input from the function button 46, the camera function is set or changed. In addition, the control unit 20 sets or changes the date or the like due to the signal input by the date button 47. The control unit 20 is connected to the light projecting unit 14 and the light receiving unit 16 of the distance measuring unit through a combined structure. The control unit 20 outputs a light emission control signal to the light projecting unit 14 to control the light projection. When the reflected light of the light light α 卩 16 is sensed, it detects the distance to the subject based on the light receiving signal. In addition, the control unit 20 is also connected to a fluorescent lamp ® 17. The control unit 20 outputs a light emission control signal to the magnesium lamp 17 under a certain condition to cause the magnesium lamp to emit light. The control section 20 is connected to the photometric section 丨 8. The control unit 20 inputs a measurement signal from the photometry unit 18 and converts the brightness of the external light into a p e x (Additive System of

Photographic Exposure) unit. In addition, the control unit 20 is also connected to Shaanmen 19. The control unit 20 opens the shutter 19 according to the exposure control when the open aperture button 1 丨 is pressed. The control unit 20 is connected to the battery 61. The battery 61 is a power source for supplying power to various parts of the camera. The control unit 20 determines whether the battery 6 丨 stores a sufficient amount of storage power required to supply the shooting operation. The control unit 20 is connected to an external memory 62. The external memory 62 stores various control parameters. As the external memory 62, EepROM is used. The control unit 20 is connected to an aperture opening button 63. Aperture release button 〇 This button switches when the shutter release button 11 is pressed. After receiving the aperture opening button 0, the control unit 20 determines that the opening shutter button n is pressed. The control unit 10 is also connected to the date recording unit 64. The date shooting section 64 is a shooting mechanism required for shooting dates and the like. In addition, the control section 20 is also connected to the film sensitivity sensor section 65, and the control section 20

TW2159PA 10 200527118 receives the sensor signal from the film sensitivity sensor 65. The film sensitivity sensor 65 is a film sensitivity detection method used to sense the sensitivity of the film loaded in the camera body 10. For example, the film sensitivity sensor 65 senses the film sensitivity after reading the CAS shown in the film cassette containing the film. In other words, the film sensitivity sensor 65 has a film sensitivity setting mechanism, and the film cassette loading chamber has four conductive terminals (one of which is a common terminal). It can be represented by the CAS code printed on the side of the film g and the blue and white checkerboard pattern. The first 3 digits of the unit sensitivity value of 1 Step, after recognizing the lead signal from the% sub, the CPU built into the camera will recognize the negative film sound. When there is no CAS encoding or reading error on the negative, the sensitivity will be set to 100 'and then the ISO (International Organization for Standardization) sensitivity will be sensed as the negative. Next, the system sensitivity of the camera will be described. The scene brightness of the present invention is displayed as L 値 according to the AρEχ method. When this L value is used when a photographic photosensitive material with an iso sensitivity of 100 is used, the opening time 値 Tv and the lens opening 値 Ay with appropriate exposure are defined as follows. L = Tv + Av The opening time 値 Tv is defined as follows. Tv = -log, Ss (Ss is the shutter opening time [seconds]) In addition, the F value of the lens aperture is defined as follows:

Av = 21 ° gFn (Fn is the F value) The system sensitivity Ls is defined as the lower limit of the L value that can be captured without hand shake. The upper limit of the camera's shutter opening time 値 Tq and the open aperture F value of the camera lens Fq, IS0 sensitivity (arithmetic expression) s of the loaded photosensitive material is expressed as follows ...

Ls = 5-l〇g2 (S / 3.125)-log2 T0 + 2 · log2 F0 Upper limit of shutter opening time 値 Tq can be set to a value that cannot be exceeded by shutter opening time (shutter speed) (this time is called the hand Shake limits shutter speed),

TW2159PA 11 200527118 This value is used as the upper limit; if the hand shake is not set to limit the shutter speed, the time can also be calculated as 1/30 [second]. In addition, the fixed number 5 in the aforementioned formula is the sensitivity labeling method of the photosensitive material method corresponding to the ISO sensitivity of 100 °). In the camera of this embodiment, it is preferable to set a hand shake to limit the shutter speed. Generally speaking, if it is shorter than the conversion time (1 / focal length [_]) [second] of the i35 format, the effect of hand shake is not likely to occur, so it is also a solution. The shorter the shutter opening time, the lower the chance of hand shake, so it is best to consider the required system sensitivity. The shorter the shutter opening time, the better. According to the foregoing meaning, if the brightness of the shooting scene is greater than the system sensitivity, an appropriate exposure can be made, and if it is lower than the system sensitivity, the appropriate exposure cannot be performed, resulting in exposure not occurring. Negative film sensitivity can read the sensitivity data recorded on the negative film through the camera. 135 format negative film will have CAS coded negative film sensitivity code. The 5 bit contacts on the negative film box can be used to judge and display, and the camera can read related data. "The achieved system sensitivity" refers to the system sensitivity calculated using the controllable open aperture on the camera, hand shake to limit the shutter speed, and the sensitivity of the loaded film, and the system sensitivity is lower than a certain value. Situation. In other words, a preset value is set on the camera side, and the system sensitivity lower than the preset value is "a specific system sensitivity is reached". ~ The sensitivity of the system for controlling exposure in the present invention can be any value, but it is preferably L64, and even Lsg is even better. The camera's corrected exposure is explained below. One of the objects of the present invention is indoor photography, and more than 80% of the main subjects in indoor photography are people photographed with indoor lighting. In such an environment, the metering of the camera, especially the simple camera, mostly uses the metering measured by Shen Yang's key average metering, but when shooting with this metering value, the main subject is often shot

TW2159PA 12 200527118 Underexposure and photos appear dark. The photometry 値 here refers to measuring the light with the brightness of the scene, so the measured result is the brightness 値 Bv (L 値 is Bv + 5) of the APEX method. In other words, "appropriate exposure value calculated by metering" means that the metering 値 is Bv and the film sensitivity 値 is Sv ′. The exposure must meet the conditions of ev (= tv + av) = Bv + Sv. An analysis of the main reasons for the aforementioned problems is as follows. 1 · The brightness of the main subject will be darker than the camera metering by about 1 ~ 3jgv. 2. The blue component will be less than 2Ev than the spectroscopic sensation used by camera metering.

The aforementioned phenomenon 1) occurs because indoor lighting is mainly centered on ceiling lighting, and vertical horizontality in the center of the room is not taken into consideration when horizontal illumination and wall illumination are used as a reference. According to a survey conducted by the inventor, the vertical illuminance near the center is lower by about N3EV compared to the illuminance on the wall. Camera metering, especially ^ The metering measured by center-weighted average metering is greatly affected by the illuminance on the wall. If the camera's metering is used for exposure control directly, the main subject will experience underexposure of about 1 ~ 3EV ( Underexposure). The aforementioned phenomenon 2) occurs in a lighting environment with a low color temperature such as a tungsten wire or a bulb. Please refer to Figure 5, which is a typical spectral sensitivity diagram of SPD photometric photon (with infrared filter). The camera's metering is performed by a photometric sensor (commonly used Cds or silicon photodiode (SPD) with infrared filter, etc.) with a spectral sensitivity of around 500 ~ 600nm as shown in Figure 5. On the other hand, please refer to item 6, which shows a spectrum example of a light source. The most representative tungsten filament-αE standard light source A ((correlated color temperature about 2850K), its energy distribution is shown in the solid line of Figure 6, has a wavelength characteristic, relative to the 500 ~ 600nm wavelength range, 40 ~ 5. The energy at a wavelength of 0 nm is small. A representative spectral sensitivity of a color negative film is shown in FIG. 7. In addition, FIG. 7 normalizes the spectral sensitivity example of the color negative film to a maximum of 値 1.

\ Si {X) R {X) E {X) dX where λ is the wavelength [nm], and 8ί (λ) is at the wavelength λ

TW2159PA 13 200527118 Spectral sensitivity (red, green, and blue layers are i; = 0, 1, 2), Ι1 (λ is the reflectivity of the object at the wavelength λ, and E (λ) is the wavelength χ The integral energy calculated by this formula is the exposure to the color negative film. However, in general, the green sensing layer and blue that are close to the photometric sensor's spectral sensitivity under light (correlated color temperature of about 5000K) Although the exposure of the color-sensitive layer is the same, the exposure of the blue-sensitive layer to the green-sensitive layer is 1 to 2 EV less than that of the green-sensitive layer under tungsten filament light. This phenomenon occurs because the spectral sensitivity of the general photometric sensor is It is designed based on human eyes, that is, the standard specific spectral sensitivity, but the spectrum is essentially located in the green light field. • The two light sources (CIE standard light source A and standard light source C) shown in Figure 6 are The spectrophotometric photometric sensor shown in Figure 5 adjusts the light source intensity (illuminance) to be the same. 'When using a color negative film with daylight sensitivity as shown in Figure 7, it is theoretically close to the spectral distribution of the C light source. sunlight For example, the color temperature of a light source is fortunately low, so the exposure of the green sensor is almost unchanged (△ omev is reduced, but the exposure of the blue sensor layer is 1.56EV less (in addition, the exposure of the red sensor layer will become larger) 0.88EV) 〇 As shown above, 'Because the main subject is usually darker than the metering of the camera, the present invention provides a metering correction of +1 · 5 EV or more to correct this problem. The "+ ΔΕν" referred to here [Ev] Corrected Exposure "refers to the correction shown in the following formula. Εν = Βν + Sv-ΔΕν The minimum required correction range is + 1 · 5 ε V, and it is best to achieve + 2 Ε V or more. It can even correct the exposure above +3 Ε V. The size of the corrected exposure can be further corrected by using information other than metering. If a color temperature sensor is used, the exposure range can be corrected based on the measured color temperature. If it is 3000K + 3EV, if it is 5000K + 2EV, it is also a good method ^^.

TW2159PA 14 200527118 can be used. You can use > = In fact, as long as you increase the exposure, you can use any method. You can also add a correction exposure, run the exposure control calculation circuit, and define the metering table for this exposure control program. This is how to correct the calculation method to reduce the light sensitivity of the film. Do the correction =, ^ is positive Λ light? Can be changed according to the brightness of the subject Yes / No Artificial light level changes. The purpose of correcting the exposure is to correct the room

Light. For the impact, in the environment without artificial lighting, it is not necessary to make corrective exposure ~ It is enough to clearly judge that the outdoor environment during the day will not make corrective exposure. If it is most likely to be night or indoor, corrective exposure will be done. These are good的 二 工 制 ^ 之-. For example, a brightness reference may be received, such as setting the reference value l 値 to two or ten (the metering value of this degree is equivalent to Bv = 5). In addition, the exposure control is not suddenly switched to [値 10, it is better to switch to the appropriate correction exposure in accordance with the brightness'. However, even outdoors during the daytime, backlighting sometimes occurs, and the subject is mostly darkened. Since the light emission of the secret light in the room during the day has less impact on the atmosphere, it is best to turn on the magnesium light to take pictures of the main subject. In the correction exposure range of the present invention in the instrument room or room, it is better not to let the magnesium lamp (that is, the auxiliary light) automatically emit light. The atmosphere of the original light source on the spot can be truly recorded without allowing the light of the magnesium light to shine, and the photo effect can convey the reality more, and it can also make the photographer and the subject not overly aware of the existence of the camera, and the picture taken can be more natural. However, it is better to be equipped with a function that, for the range below the system sensitivity, an underexposure warning signal will be issued to the photographer to urge the photographer to use the auxiliary light. The operation of the camera of this embodiment will be described below. Please refer to FIG. 8, which shows the automatic camera function of the camera of this embodiment, and shows the flow of its control processing. FIG. 0 The exposure setting and magnesium light emission of the camera of this embodiment have the following characteristic actions of TW2159PA 15 200527118. "Preset action function at the time of the second source A will be displayed on the display section 50. As long as the standby state of the automatic camera function is shown in Figure 8 = the camera will follow the loading level." If the battery is not in a certain state ... When the residual is not above a threshold value, it will show that the battery is dead.

A) 'End the control processing operation. On the other hand, when the battery M's residual storage capacity is on Jiang and Er, the calculation of ... 値 is performed (814), and the calculation processing of 値 is: 〃. The measurement signal of 卩 18 is converted to Βν 値 for calculation.丄 Then enter S16 to calculate the system sensitivity Ls and determine whether u is below 3. Use = to judge whether the sensitivity 値 Sv of the negative is below 9. For example, when the sensitivity of the loaded negative is 1600 (Sv9), the system sensitivity Ls of the camera will be 3. Therefore, when loading a film with ISO sensitivity above 1_, the camera will judge the system sensitivity.

Ls is below 3. If the loaded negative is below the sensitivity range, the camera will judge that the system sensitivity Ls is over 3. Then, if the child's month S16 is judged, the system sensitivity Ls exceeds 3a. When s 16 determines that the system sensitivity L s exceeds 3, a ranging calculation (S2G) is performed. The distance calculation is based on the nose signal processing of the distance to the subject based on the output signal of the light receiving unit 16. Then proceed to S22 for exposure calculation. The exposure calculation process is a process for calculating EV 値, and calculation is performed according to the following calculation formula. Ev = Bv + Sv Then go to S24 to determine whether Ev 値 is above 16. When it is judged that Ev 16 is more than 16, Εν 値 is set to 16 (S26), and then proceeds to s28. On the other hand, if S24 judges that νν 値 is not 16 or more, it will go directly to §28. S28 will calculate F value and shutter opening time according to Εν 値. Calculus here

TW2159PA 16 200527118 processing is based on the exposure program line stored in the control unit 20 or the external memory 62. Then, the process proceeds to S30, and it is judged whether the shutter opening time is shorter than 1/30 [sec. \ It is judged that the shutter opening time is shorter than 1/30 [sec.], And the process proceeds to S34. 2: Face to face, the shutter opening time is longer than 1/30 [sec] feldspar, then set / 30 [sec] (S32) and enter S34. Horse AF drive processing is based on the subject. For example, the control unit 20 will drive the control signal to move the focal length lens so that the focus pair is ready. S34 performs AF driving processing. The processing number of the distance adjustment moving focus lens is output to the focus drive unit (not shown) and the focus is adjusted.

Then, the process proceeds to S36, and the shutter opening operation light is emitted (the lock light is illuminated). Then go to $ 58. Start the magnesium light under certain conditions. As a result, when the loaded film does not meet a certain system sensitivity, exposure control will be performed within the shutter control range, and the shutter opening time is controlled to be lower than the hand shake limit shutter speed 1/30 [sec] Make the exposure appropriate. Ev (= Av4-Tv) = Bv + Sv In addition to encountering the metering brightness 値 above βν5 (that is, ^ 値 1〇) and the distance measurement result shows that it is farther than 10m, the ballast lamp will emit light according to certain conditions To get the right amount of exposure. The & action is a commonly known machine, which is equivalent to, for example, the factory aut〇 of Fuji Photo SilWeF28, a point-and-shoot camera made by Fuji Teruyoshi Kogyo Co., Ltd. The exposure control when the IS0800 film is loaded on the machine An example is shown by the dotted line in the ΔΕν-Βν diagram of FIG. 9. Next, the case when S16 determines that the system sensitivity Ls is 3 or less. s j 6 When the right judgment system sensitivity Ls is 3 or less, it is determined whether Bv 値 is 5 or less (S18). When it is judged that Bν 値 is 5 or more, the camera will recognize that it is in the shirt ring i outside the room during the daytime and enter S20. On the other hand, when s 18 judges that Bv 値 is less than 5, it will recognize that it is indoor or outdoor photography environment at dusk and night, and enter S40.

Ding W2159PA 200527118 ㈣Μ㈣㈣ 算. The ㈣calculation processing is the ㈣6 calculation when the output signal is used to calculate pure shot ㈣6. The exposure calculation process is the process of calculating ^ 値 into the calculation formula to perform the calculation. According to the following performance

Ev = Bv + Sv-AEv ΔΕν in the aforementioned calculation formula is the corrected exposure amount. According to the solid line of Bv 9, there is-the exposure control table is based on V 値 and coffee 预先 beforehand, ΔΕν is based on the exposure Control table settings.

: When Bv 値 is Bu 5 [Εν], ^ must be set to +3 [Εν]. Then calculate the Ev value with the set ΔEν. ▲ Then enter S44 'in Figure 8 to calculate the F value and the shutter opening time according to Εν ° ° The difference processing is to use the exposure program stored in the control section 20 or the external memory 62 in advance, as shown in Figure 10 Line graphs are calculated. Then enter S46 to determine whether Bv 値 is worse than the system sensitivity. When it is judged that Bv 値 is greater than the system sensitivity, it proceeds to S50. On the other hand, if it is judged that Βν 値 is more sensitive than the system sensitivity, a warning process will be performed. The warning process is a process for warning of underexposure. For example, the warning light-emitting part 42 will flash, and a certain mark will flash on the display part 50. Then it proceeds to S50 to judge whether the shutter opening time is longer than 1/30 [second]. When it is judged that the shutter opening time is shorter than 1/30 [second], it proceeds to S54. The other side: When it is judged that the shutter opening time is longer than 1 / 3G [second], the shutter opening time is set to i / 30 [second] (S52), and then the process proceeds to S54. S54 will do AF drive processing. The AF driving process is a process of moving the focal length lens according to the distance from the subject. For example, if the control unit 20 outputs a drive control signal to the focus drive unit (not shown), the focus lens is moved to focus on the subject. Then go to S 5 6 to start the shutter opening action when the ballast light does not shine.

TW2159PA 18 200527118 Here, the camera actions from the judgment of whether Bv 値 reaches 5 (S18) to the shutter opening action (S36 or S56) are as follows. When loading negatives that conform to the n-sensitivity, if the metering is below Bv5 (= l 镇 10), the ballast lamp will not emit light, and the + 3Ev correction exposure will be performed, that is, the existing light will be used for photography under the following conditions .

Ev = Bv + Sv-3 However, the exposure value of the shutter opening time is set higher than the hand shake limit shutter speed f 1/30 [sec]. Therefore, when a thin film is loaded and the metering light is below _ (i.e., 値 L) 6), the aperture is fixed at P2 · 0, and the shutter opening time is fixed at 1/30 [second]. In addition, if the metering light is below the system sensitivity [値 3 or less (Bν < -2), the warning light-emitting section 42 will flash and the display section 50 will also display a certain blinking mark, and healthy photographers can operate the light-emitting function of the magnesium lamp. In addition, in the case of this camera function, a natural photography mark 5 1 d appears on the display portion 50. On the other hand, when Bv 値 is 5 or more, adjust the metering 値 for proper exposure control within the shutter control limits, in other words, adjust it to the exposure control that meets the following calculation formula.

Ev (= Av + Tv) = Bv + Sv However, if the control limit of the shutter is exceeded by 値 (the camera in this embodiment is Εν > 16), control is performed based on the control limit Εν 値. (The camera in this embodiment is Ev = 16) After the shutter opening operation (S36 or S56), the process proceeds to S58 in FIG. 8 to perform the lens reset operation. This lens reset action is the process of bringing the focal length lens back to a certain standby position. For example, the control unit 20 outputs a drive control signal to the focal length drive unit (not shown). Then rotate the negative (S60) to enter the tape drive state (S62). As mentioned above, when the film filled with g t is lower than the specific threshold of the system sensitivity, the ballast lamp will not emit light, and the metering threshold will be directly + 3Ev to correct the exposure and shoot the subject.

TW2159PA 19 200527118 Photos that can be naturally presented automatically take the original atmosphere of the scene. For example, when shooting inside, the spotlight will not emit light, so the shooting effect of the subject will not be unnatural. It also prevents the subject from being affected by the yellow light when the lamp is illuminated. When shooting at night, it can prevent the problem that the magnesium lamp cannot illuminate the main subject's hall, and the moonlight is dark. In addition, underexposure of people can be prevented if the background brightness is high. If the correction exposure for this day is more than +1 · 5Eν, it is not necessary to limit the exposure to + 3Eν. In addition, other camera functions will be described. When the camera of this embodiment encounters the forced light function of the magnesium light, it uses the same exposure program as the aforementioned automatic camera function, but it will control the exposure amount to make the light of the magnesium light according to the distance measurement result. Therefore, if a film with an ISO sensitivity of 1600 or higher is loaded, when the metering result is Bv 2 (that is, 疋 LV7), the function is the same as that of the automatic function. The exposure will be exposed at a corrected exposure level, and the magnesium lamp will also be exposed at an appropriate intensity of ISO1600. In the red-eye prevention function, the exposure and the amount of magnesium light will maintain the forced light function of the magnesium light. However, in order to prevent the red-eye effect when the light is illuminated, the light will be emitted one or more times before the shutter opening. . For the function of a person's nighttime spotlight camera, the exposure program is the same as that for preventing the red suction effect, except that the hand shake restriction is removed. If the light-emitting function of the meter light is prohibited, it will not emit light even in the self-deficit state, and will continue to shoot. First Embodiment The camera of the first embodiment just described can be modified as follows. Its features are: a well-known color temperature detection sensor unit is added to the front camera. When the negative film B temple with an ISO sensitivity of 1600 or higher is loaded, the automatic temperature will give + 2EV correction exposure when the color temperature is above 3 °, If it is less than 38〇κ, the correction amount will be set to.

TW2159PA 20 200527118 In this situation, compared with the first embodiment, when the color temperature is above 3800k, the shutter opening time can be accelerated, and the frequency of hand shake and moving body shake can be reduced. In terms of industrial potential, it can automatically take photos that can show the surrounding atmosphere without using auxiliary lights such as magnesium lamps. In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications without departing from the spirit and scope of the present invention. Changes and retouching, so the scope of protection of the present invention shall be determined by the scope of the attached patent application. field

TW2159PA 21 200527118 [Brief Description of the Drawings] FIG. Is a perspective view of a front appearance of a camera according to a first embodiment of the present invention. FIG. 2 is a perspective view of the appearance of the back side of the camera in the embodiment. FIG. 3 is an explanatory diagram of a display portion of the camera of FIG. 1. FIG. Fig. 4 is a schematic diagram showing the configuration of the camera of Fig. 1; Figure 5 shows an example of the spectral sensitivity of a Silicon Photo Diode photometric sensor equipped with an infrared filter. Fig. 6 shows the distribution of the splitting energy between the light of the crane wire (solid line; CIE standard light source A) and the quasi-light source (dotted line; CIE standard light source c). Figure 7 is a representative spectral sensitivity of a color negative film. Fig. 8 is a flowchart of the camera from the press of the release button to the completion of shooting under the automatic function in the first embodiment of the present invention. The solid line in FIG. 9 is the exposure control during the automatic function when the negative film with ISO sensitivity of 600 is loaded into the camera of the first embodiment, and the dotted line is when the negative film with ISO sensitivity 800 is filled on the same camera. The ΔΕν-Βν graph of dew light control under automatic function. The horizontal axis is the photometry 値 (Bv 値. L 値 combined with σ loading) measured by the central focus metering method, and the vertical axis is the corrected dew light amount ΔΕν [Εν]. • Fig. 10 is a line diagram of a program according to the first embodiment of the present invention, when the camera is loaded with a negative ISO 1600 film under the automatic function. [Description of main component symbols] 10: Camera body 11: Open shutter button 13: Lens body 14: Light projection section TW2159PA 22 200527118 16: Light receiving section 17: Magnesium lamp 18: Metering section 19: Shutter 20: Control section 65: Film sensitivity Sensing section 80: exposure setting sections S10 ~ S62: method flow

TW2159PA 23

Claims (1)

200527118 10. Scope of patent application: 1. A film-loading camera with the following features: • The exposure setting section expresses s in the arithmetic of the ISO sensitivity of the loaded film. The aperture value F0 of the Hai camera is different from the upper limit of the shutter opening time of the camera. The sensitivity of IS0 when the loaded film is calculated by the system sensitivity Ls defined by the following formula (A) When it is lower than a certain threshold, the exposure condition setting of the exposure setting section will give a metering threshold of + 1.5Ev and a corrected exposure; LS = 5-l0g2 (S / 3 · 125) —10g2TQ + 2 · 10 g2FQ formula (α). 2. The film-filled camera described in item 1 of the scope of patent application has the following features: The exposure setting section will perform the corrected exposure only when the metering range is below the specified range. 3. The negative film loading camera described in item 1 or 2 of the scope of patent application, has the following characteristics: The exposure setting section will perform the corrective exposure action when it encounters the loading of negative films such as the system sensitivity Ls is 4 or less . 4. The film-filled camera described in item 1 or 2 of the scope of patent application, has the following characteristics of φ: The far exposure setting unit will limit the upper limit of the shutter opening time 値 T 〇 to be set to a certain value or more. 5 · The film-filled camera described in item 1 or 2 of the scope of patent application, has the following characteristics: The far exposure setting unit encounters the upper limit of the shutter opening time 値 T 〇 When not set, it is 1/30 The upper limit of the shutter opening time in seconds, To, calculates the system sensitivity Ls. 6. The film-filled camera according to the first or second patent application scope, with TW2159PA 24 200527118, which has the following characteristics: The red sea exposure setting section includes a photometric section, a film sensitivity sensor section and a control section. The photometric section Measure the brightness outside and inside the photographic field of view. The film sensitivity sensor detects the loaded film sensitivity. The control unit uses the measurement signal input by the light control unit and the sensor signal input from the film sensitivity sensor to calculate the system sensitivity Ls. And set the exposure conditions to control the shutter opening action. 7. The film-filled camera described in item 1 or 2 of the scope of patent application, has the following characteristics: when the exposure setting section sets the exposure conditions, the auxiliary light will not emit light. 8. A film-filled camera equipped with the following action steps and a method for setting exposure conditions, including: a step of measuring the brightness of light inside and outside the photographic field of view; expressing the ISO sensitivity of the loaded film with the value of s and the aperture value F of the camera. And the upper limit of the shutter opening time of the camera, Tq [sec], a step of calculating the system sensitivity Ls defined by the following formula (A); and when the system sensitivity Ls is below a certain threshold, metering will be given + 1 5EV or more Steps to correct the exposure; # Ls = 5-l0g2 (S / 3 · 125) -l0g2T. + 2 · 10 g 2F. · Formula (A) TW2159PA 25