The $100 Canon Selphy cheap CP740 is an entry-level compact photo printer whose limited onboard feature set reflects its relative position among dedicated 4×6 photo printers. The Selphy CP740 is indeed compact and can be easily slipped into a tote bag or large purse. Canon Selphy CP740 measures 7 inches wide, 2.5 inches tall and 5 inches deep. This cheap printer weighs 2.1 pounds without the ink installed, paper cassette attached, or power brick plugged in; with all of the necessary accoutrements it gets a bit heavier.
A 2-inch color LCD is also embedded right in the surface of the Selphy cheap CP740. On the front edge of this cheap printer are three memory card slots that can accept most common memory cards, though some will require an adapter. There’s also a retractable mini-USB cable for directly connecting PictBridge. The Selphy CP740 comes with a postcard-size cassette and a starter ink cartridge that is good for only five prints (five sheets of paper are also included). Paper and ink are sold together in packages, and the ink is calibrated for the number of sheets in the package.
Canon Selphy CP740 produces 4×6 photos at a rate of 0.92 pages per minute, faster than many of the single-function and multifunction inkjet printers. Standard 4×6 test print produced on the Selphy CP740 showed sharp, clear details and pleasing skin tones. The colors looked a bit cool, and we’d prefer a brighter, warmer look. But overall, the Selphy CP740 produced prints that were good enough for casual home users.
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Ink cartridge and ink-jet printer Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink cartridge which supplies an ink to an ink-jet head for performing printing by discharging the ink, and an ink-jet printer including the same.
2. Description of the Related Art
An ink-jet printer is known, in which an ink is discharged from nozzles to recording paper to perform the printing. Such an ink-jet printer is generally provided with a detachable ink cartridge. When an ink-jet head is driven to perform the discharge operation in a state in which the ink is empty in the ink cartridge, then the printing is not only performed, but the air sometimes makes invasion into the ink-jet head. The ink-jet head, into which the air has made invasion, cannot be used in some cases. Therefore, it is necessary to detect the amount of the ink stored in the ink cartridge. A method for detecting the amount of the ink is conceived, in which the amount of the ink is detected by estimating and accumulating the amounts of the ink used every time when the printing is performed. However, any error tends to arise in such calculation. Therefore, it is necessary to stop the use of the ink cartridge with a sufficient margin. As a result, the ink is wasted. Accordingly, the following technique has been suggested (see, for example, Japanese Patent Application Laid-open No. 9-001819, FIG. 7). That is, a float, which has a specific gravity smaller than that of the ink, is arranged on the ink contained in the ink cartridge. The height of the float floating on the ink is detected from the outside to detect the amount of the ink contained in the ink cartridge. (more ink cartridges…)