DE102018213980A1 - Household appliance with a manual input device - Google Patents

Abstract

The invention relates to a household appliance which comprises a manual input device (61). The input device (61) comprises a projection device which is set up to project a plurality of input fields (29) onto a projection surface (28), and a sensor device (74) which is set up to approach an object or touch the object to recognize the projection fields (28) of the projected input fields (29) in order to recognize an input into the input device (61) associated with the corresponding input field (29).

Description

The invention relates to a household appliance comprising a manual input device with which e.g. Operating parameters of the household appliance can be entered.

Household appliances such as Household refrigeration appliances, dishwashers or washing machines comprise a manual input device with which operating parameters can be entered for the operation of the corresponding household appliance. In the case of a household refrigerator, this is e.g. its target temperature, in the case of the dishwasher an input of a special washing program and in the case of the washing machine the input of a special washing program.

The object of the present invention is to provide a household appliance with an improved input device.

The object of the invention is achieved by a household appliance, comprising a manual input device which comprises a projection device which is set up to project a plurality of input fields onto a projection surface, and a sensor device which is set up to bring an object closer to or touch the object to recognize the input fields projected onto the projection surface in order to recognize an input into the input device assigned to the corresponding input field.

The household appliance according to the invention is e.g. a household refrigerator, dishwasher, washing machine or oven.

The household appliance comprises in particular an electronic control device which is set up to control the intended operation of the household appliance. The input device is connected, in particular, to the electronic control device in order, in particular, to input operating parameters for the electronic control device. In the case of a household refrigerator, the operating parameter is e.g. its target temperature, in the case of the dishwasher an input of a special washing program and in the case of the washing machine the input of a special washing program.

The input device of the household appliance according to the invention comprises the projection device, which is able to project the input fields onto the projection surface during operation of the household appliance. The household appliance preferably comprises the projection surface. The projection surface is preferably flat. The input fields include in particular letters, characters and symbols.

The input device also includes the sensor device. This is set up to detect an object approaching or touching the object of the input fields projected onto the projection surface in order to recognize an input into the input device associated with the corresponding input field. Approaches e.g. a finger of an operator as an object or touching one of the input fields, then the sensor device recognizes this. The input device thereby recognizes that this input field is “activated”, i.e. that an input assigned to this input field is activated in the input device in order to e.g. to transmit the electronic control device.

The sensor device preferably comprises proximity sensors, in particular infrared proximity sensors.

The input device can comprise a housing in which the projection device and the sensor device are fastened to the housing.

The household appliance according to the invention can include an interior, a door leaf provided for opening and closing the interior, which has an inside facing the interior and an outside facing away from the interior, and a recessed grip arranged in the outside of the door leaf. The recessed grip comprises a handle which forms an undercut with respect to the outside of the door leaf. The input device is preferably at least partially arranged in the handle, in particular integrated in this.

If the household appliance according to the invention is a household refrigeration appliance, then this comprises, in particular, a heat-insulated body with an inner container which delimits the interior. The interior is then a coolable interior, which can be closed by means of the door leaf and can be cooled by means of a cooling device for cooling the coolable interior. The household appliance according to the invention, designed as a domestic refrigeration device, comprises in particular the electronic control device, which is set up to control the refrigeration device in such a way that the coolable interior has at least approximately a desired temperature. The target temperature can be set with the input device.

The household refrigeration device according to the invention can be, for example, a household refrigeration device. In this case the coolable interior is cooled to temperatures above 0 ° C. The household refrigerator according to the invention can also be a household freezer. In this case, the coolable interior is cooled to temperatures below 0 ° C. The household refrigerator according to the invention can also be a freezer-fridge combination. The household refrigeration device according to the invention can have exactly one coolable interior, but also several coolable interiors, which can also be closed and opened by means of a door leaf.

The recessed grip in particular comprises a recess which only partially overlaps the handle and which comprises an outwardly directed surface. This surface is preferably flat. This surface preferably forms the projection surface, so that the projection device is able to project the input fields onto the preferably flat surface of the depression. The projection device thus projects the input fields into the recessed grip. Due to the arrangement or integration of the projection device and the sensor device at least partially in the handle, these can be arranged relatively close to this special projection surface.

The door leaf preferably comprises a cover which covers the depression and forms the projection surface with its outward-facing surface. The outward surface is preferably flat. Because of the cover, different projection surfaces can be provided in a relatively simple manner.

Since the input fields are only projected into the recessed grip when the projection device is switched on, the input fields are invisible to an operator when the projection device is switched off. As a result, an input device can be created which, when switched off, is invisible to the operator.

If the cover is used for the recess, then an input device can also be created, which can be combined with different materials.

The housing preferably forms at least partially the part of the handle forming the undercut. The projection device and the sensor device can thus be mounted in the household appliance in a relatively simple manner. As a result, the projection device and the sensor device can be combined into one module.

In the area of the handle, the door leaf can comprise a pocket, which is designed in particular as a backing part and in which the housing is fastened with the projection device and sensor device fastened therein.

The household appliance according to the invention can thus be assembled by pushing the housing with the projection device and sensor device fastened therein into the pocket, and fastening the cover in the recessed grip in order to cover the depression, the outwardly facing surface of the cover forming the projection surface. The housing with the projection device and sensor device fastened therein can e.g. can be fixed in the pocket by means of a catch.

The side of the housing facing the outside of the door leaf can comprise an opening. Through this opening, the projection device and the sensor device can be guided into the housing for assembly. The opening of the housing is preferably closed with a housing cover.

The housing comprises in particular a first housing region forming the undercut and a second housing region which follows the first housing region and is arranged within the door leaf. The second housing area preferably has a greater depth than the first housing area. The first housing area is in particular assigned to the handle or forms it.

The projection device is preferably designed as a slide projector. The slide projector in particular comprises a light source, e.g. an LED, a collimation lens following the light source, which converts the light generated by the light source into a parallel beam of rays, a slide following the collimation lens, through which the beam of rays can pass, and a projection lens following the slide for generating a projection beam from the through the slide rays of light that have passed through. The projection beam is intended to strike the projection surface in order to project the input fields onto the projection surface. The slide includes a picture of the input fields. The collimation lens thus bundles the light from the light source and directs it onto the projection lens. This structure ensures a relatively high depth of field of the slide projector with a relatively low manufacturing cost. The parallel beam or the projection beam is assigned a projection axis which is aligned parallel to the parallel beam.

The light source, the slide and the collimation lens are preferably arranged within the second housing region, that is to say they are fastened in the partial region of the housing arranged within the door leaf. The projection lens is preferably arranged within the first housing area, that is to say in the partial area which is assigned to the undercut or the handle. This allows this embodiment of a slide projector can be arranged at least partially in the handle in a relatively space-saving manner.

The slide projector can comprise a deflection mirror following the projection lens, which deflects the projection beam in the direction of the projection surface. The deflection play gel is preferably also arranged in the first housing area.

Preferably, the distances between the collimation lens, the slide and the projection lens are chosen such that the collimation lens and the slide are located in the wide part of the module, i.e. located in the second housing area of the housing, and thus not within the relatively narrow handle.

The deflection mirror which may be present is preferably set forward as far as possible in order to keep the projection angle onto the projection surface as large as possible.

According to one embodiment of the household appliance according to the invention, the slide projector comprises a plurality of partial slide projectors arranged next to one another, each comprising a collimation lens, a slide lens following the corresponding collimation lens, and a projection lens following the corresponding slide lens, and the partial slide projectors each projecting one of the input fields onto the projection surfaces.

Depending on the embodiment of the household appliance according to the invention, this can be mounted differently. If the input device comprises the housing, then in particular the projection device and the sensor device are combined to form the module or an assembly. Then the module itself can be mounted in a backing part in the door leaf. This deposit part can e.g. be integrated into this as part of the handle or as a separate part on the handle, on the outside of the door leaf, which is in particular designed as a door panel, or on the inside.

The module is then e.g. inserted into this backing part and, if necessary, locked. The cover for the depression is then inserted into the contour of the handle and thus forms a relatively clean transition to the module and in particular covers a gap between the module and the backing part which may have arisen during assembly. This cover can be made of different materials, e.g. made of wood, ceramic, glass or metal. There is no influence on the operability, since the operation or input process is detected by the module itself and no touch sensors attached behind the cover are necessary.

The design of the input device can preferably be optimized in terms of injection molding technology and in terms of simple assembly while maintaining relatively small tolerances. The individual parts are preferably inserted into the housing, which is in particular made of plastic. Structural contours are preferably provided on all components to ensure that they are installed correctly (Poka-Yoke). The housing cover attached after the assembly of the inner components fixes all components in their position.

• 1 ein Haushaltskältegerät mit zwei nebeneinander angeordneten Türblättern, die jeweils eine Griffmulde umfassen,
• 2 eine Frontansicht eines der Türblätter,
• 3 eine Seitenansicht dieses Türblatts
• 4 das Türblatt in einer perspektivischen und teilweise geschnittenen Darstellung,
• 5 in einer perspektivischen und teilweise geschnittener Darstellung einen Teilbereich der Griffmulde, der eine Eingabevorrichtung aufweist, die eine als Diaprojektor ausgebildete Projektionsvorrichtung, eine Sensorvorrichtung und Eingabefelder umfasst,
• 6 in einer perspektivischen Darstellung und geschnittenen Darstellung den Diaprojektor und die Sensorvorrichtung,
• 7 eine Seitenansicht des Diaprojektors und der Sensorvorrichtung in geschnittener Darstellung,
• 8 eine Draufsicht des Diaprojektors und der Sensorvorrichtung,
• 9 eine Draufsicht eines Teils des Diaprojektors und der Sensorvorrichtung,
• 10 ein Gehäuse des Diaprojektors und der Sensorvorrichtung in einer perspektivischen Darstellung,
• 11 einen Ausschnitt des Gehäuses,
• 12 einen Gehäusedeckel,
• 13 Einen Ausschnitt des Gehäusedeckels, und
• 14, 15 Linsen und Diarahmen des Diaprojektors.

An exemplary embodiment of the invention is shown by way of example in the accompanying schematic drawings. Show it:

• 1 a household refrigerator with two door leaves arranged side by side, each comprising a recessed grip,
• 2 a front view of one of the door leaves,
• 3 a side view of this door leaf
• 4 the door leaf in a perspective and partially cut view,
• 5 a perspective and partially sectioned representation of a partial area of the recessed grip which has an input device which comprises a projection device designed as a slide projector, a sensor device and input fields,
• 6 a perspective view and a sectional view of the slide projector and the sensor device,
• 7 a side view of the slide projector and the sensor device in a sectional view,
• 8th a plan view of the slide projector and the sensor device,
• 9 a plan view of part of the slide projector and the sensor device,
• 10 a housing of the slide projector and the sensor device in a perspective view,
• 11 a section of the housing,
• 12 a housing cover,
• 13 A section of the housing cover, and
• 14 . 15 Lenses and slide frames of the slide projector.

The 1 shows a front view of a household refrigerator 1 as an example of a household appliance.

The household refrigerator 1 has a thermally insulated body 2 with an inner container that has a coolable interior space intended for storing food 4 limited. Inside the coolable interior 4 are, for example, shelves 5 arranged for storing the food.

That in the 1 shown household refrigerator 1 includes in particular two relative to the body 2 hinged door leaves 20 . 20a , each with a recessed grip 23 include. The door leaves 20 . 20a are provided the coolable interior 4 to be closed and made accessible when open. In the case of the present exemplary embodiment, the left door leaf is 20a opened and the right door leaf 20 shown closed. The right door leaf 20 is in the 2 as a front view, in the 3 as a side view and in the 4 shown in a perspective and partially sectioned representation.

In the case of the present exemplary embodiment, the household refrigeration device comprises 1 an interior designed as a freezer compartment, which is below the one with the door leaves 20 . 20a lockable coolable interior 4 is arranged and by means of a pull-out drawer from the freezer 6 is provided.

In the case of the present exemplary embodiment, the household refrigeration device comprises 1 a refrigeration device 7 in particular in the form of a refrigerant circuit and one for controlling the refrigeration device 7 provided electronic control device 8th , This is in particular set up the refrigeration device 7 to be controlled in a manner known to the person skilled in the art in such a way that the coolable interior 4 and the freezer compartment has at least approximately predetermined or predefinable target temperatures. The electronic control device 7 is preferably set up in such a way that it measures the temperatures of the coolable interior 4 and regulates the freezer compartment, as is known in principle to the person skilled in the art. If necessary, the actual temperatures of the coolable interior 4 and the freezer, the household refrigerator can 1 not shown and with the electronic control device 8th have connected temperature sensors. In particular, is in the operation of the household refrigerator 1 the target temperature of the freezer compartment is less than 0 ° C and the target temperature of the coolable interior 4 greater than 0 ° C.

The door leaves 20 . 20a each include a coolable interior 4 facing inside 21 , the coolable interior 4 facing outside 22 , and that in the respective outside 22 of the door leaves 20 . 20a arranged recessed grip 23 , The 5 shows a perspective and partially sectioned representation of a portion of the recessed grip 23 ,

The recessed grip 23 includes a handle 24 which has an undercut on the outside 22 of the door leaf 20 forms.

The recessed grip 23 includes in particular a specialization 25 , which is only partially due to the handle forming the undercut 24 is covered. In the case of the present exemplary embodiment, the depression comprises 25 a cover designed as an insert 26 that have an outward-facing, flat surface 27 having.

In the case of the present exemplary embodiment, the household refrigeration device comprises 1 a manual input device 61 , with the operating parameters of the household refrigerator, for example 1 can be entered. The input device 61 comprises a projection device designed as a slide projector, which operates the household refrigerator 1 an image on a screen 28 able to project, and a sensor device 74 , In the case of the present exemplary embodiment, the outwardly directed flat surface forms 27 the cover 26 the deepening 25 this projection screen 28 , The slide projector and the sensor device 74 are particularly at least partially under control 24 integrated. The 6 shows the input device in a perspective and sectional view 61 , the 7 shows a side view of the input device 61 in section and the 8th shows a top view of the input device 61 , The 9 shows a section of the input device 61 as a top view.

In the case of the present exemplary embodiment, the projected image is several on the projection surface 28 projected input fields 29 , which in turn can each comprise a character, a letter or a symbol.

The input device 61 is with the electronic control device 8th be connected so that it can control the slide projector, among other things.

The input device 61 in the case of the present exemplary embodiment comprises a housing 62 inside which the slide projector and the sensor device 74 on the housing 62 are attached. The housing 62 the input device 61 is in a perspective view in the 10 shown. The 11 shows a section of the housing 62 ,

The housing 62 may include an opening through which the slide projector and the sensor device 74 in the housing 62 be carried out for assembly. The opening of the case 62 is preferably with one in the 12 shown housing cover 62a locked. The housing 62 and the housing cover 62a are especially made of plastic.

The door leaf 20 includes especially in the area of the handle 24 a pocket 30 , which is designed in particular as a backing part and in which the slide projector and the sensor device 74 the input device 61 with the housing 62 is attached.

The household refrigerator 1 can thus be assembled by the housing 62 with attached slide projector and sensor device 74 in the pocket 30 is pushed, and the cover 26 in the recessed grip 23 is attached to the recess 25 cover. The housing 62 can be locked in your pocket, for example 30 be fixed.

In the case of the present exemplary embodiment, the housing comprises 62 the input device 61 one the undercut of the handle 24 assigned first housing area, in particular forming the undercut 63 and a the first housing area 63 subsequent, inside the door leaf 20 arranged second housing area 64 , The second housing area 64 in particular has a greater depth than the first housing region 63 on.

In the case of the present exemplary embodiment, the slide projector comprises a plurality of partial slide projectors arranged next to one another 91 , The partial slide projectors 91 in particular each comprise a collimation lens 65 , one of the corresponding collimation lenses 65 following slide 66 , and the corresponding slide 66 subsequent projection lens 67 , The individual slide projectors 91 project one of the input fields 29 onto the projection surface 28 , The collimation lenses 65 who have favourited Slides 66 or their slide frames 66a , and the projection lenses 67 are as top views in the 13 shown.

In the case of the present exemplary embodiment, the collimation lenses are arranged next to one another 65 into a single component 92 summarized. Even the side-by-side projection lenses 67 are a single component 94 summarized, and the slide frames 66a the slide 66 are also a single component 93 summarized. These components 92 - 94 are especially made of plastic and were preferably manufactured using the injection molding process.

The slide projector includes a light source 68 that the collimation lenses 65 follow. The light source 68 comprises in particular several LEDs 69 which, for example, on a circuit board 70 are attached. In particular, each of the slide projectors 91 one of the LEDs 69 assigned, ie each of the sub-projectors 91 includes an LED 69 ,

The collimation lens 65 convert that from the light source 68 or the individual LEDs 69 generated light in parallel rays of light through the slides 66 step through to turn away from the projection lenses 67 are converted into projection beams, each of which provides information about the display surfaces to be projected 29 include.

Corresponding projection axes are the beams or the projection beams 71 assigned.

In the case of the present embodiment, the light source 68 or the LEDs 69 who have favourited Slides 66 and the collimation lenses 65 within the second housing area 64 arranged, that is in the inside of the door leaf 20 arranged portion of the housing 62 the input device 61 , The projection lenses 67 are within the first housing area 63 arranged, that is in the portion that the undercut or the handle 24 assigned.

In the case of the present exemplary embodiment, the slide projector comprises one of the projection lenses 67 following deflecting mirror 72 , which the projection beam in the direction of the projection surface 28 deflects. The deflection game gel 72 is also in the first housing area 63 of the housing 62 attached.

The housing 62 includes molded windows 73 through which the from the deflecting mirror 72 deflected projection beam 71 out of the housing 62 passes.

In the case of the present embodiment, the cover is 26 and thus the projection surface 28 or that of the projection surface 28 assigned plane with respect to the parallel beam or its projection axis 71 misaligned. The projection surface 28 or their associated plane closes with the parallel beam or the projection axis 71 preferably an angle of 5 ° to 45 °.

In the case of the present exemplary embodiment, the housing comprises 62 rest-free guides 95 . 96 . 97 , into which the combined components 92 . 93 . 94 of the collimation lenses 65 , Slide frames 66a and projection lenses 67 for attachment to the housing 62 are inserted without rest.

Furthermore, the housing cover 62a executed in such a way that it is a single component 92 . 93 . 94 chamfered collimation lenses 65 , Slide frames 66a and projection lenses 67 in the guides 95 . 96 . 97 presses, causing the components 92 . 93 . 94 in the housing 62 are fixed. To the components 92 . 93 . 94 in the guides 95 . 96 . 97 can press the the interior of the case 62 facing surface 80 of the housing cover 62a molded ribs 81 include.

In the case of the present exemplary embodiment, it comprises the interior of the housing 62 facing surface 80 of the housing cover 62a contoured ribs 82 , and the component 92 summarized collimation lenses 65 that go to the component 93 summarized slide frames 66a and the component 94 summarized projection lenses 67 one contour each 98 , especially a V-shaped contour, with which the contoured ribs 82 are able to work together positively to form the components 92 - 94 summarized collimation lenses 65 , Slide frames 66a and projection lenses 67 inside the case 62 to fix.

The ends 99 . 99a the one to the collimation lenses 65 , Slide frames 66a and projection lenses 67 summarized components 92 - 94 preferably include different contours to ensure that they are installed correctly (Poka-Yoke).

With the sensor device 74 can in particular operating parameters of the household refrigerator 1 , such as its target temperature, can be entered.

The sensor device, 74 is set up to approach an object, for example an operator's finger, or to touch the object on the projection surface 28 to recognize projected input fields in order to recognize an input assigned to the corresponding input field in the input device.

The sensor device 74 comprises in particular a plurality of proximity sensors arranged next to one another 75 , in particular infrared proximity sensors, in particular on a circuit board 78 are attached. In particular, one of the proximity sensors is in each case 75 one of the slide projectors 91 assigned. The one from the proximity sensors 75 In the case of the present exemplary embodiment, signals emitted can be sprayed on through additional windows 77 of the housing 62 pass.

LIST OF REFERENCE NUMBERS

1

Household refrigerator

2

thermally insulated body

4

coolable interior

5

shelves

6

drawer

7

A refrigeration system

8th

electronic control device

20

door leaf

20a

door leaf

21

inside

22

outside

23

grip

24

Handle

25

deepening

26

cover

27

flat surface

28

projection

29

fields

30

bag

61

input device

62

casing

62a

housing cover

63

first housing area

64

second housing area

65

collimating lens

66

transparency

66a

Slide mounts

67

projection lens

68

light source

69

LEDs

70

circuit board

71

projection axis

72

deflecting

73

window

74

sensor device

75

Proximity sensors

77

more windows

78

circuit board

80

surface

81

ribs

82

contoured ribs

91

Teildiaprojektor

92-94

components

95-97

guides

98

contour

99, 99a

end up

Claims (11)

Domestic appliance, comprising a manual input device (61) which comprises a projection device which is set up to project a plurality of input fields (29) onto a projection surface (28), and a sensor device (74) which is set up to approach an object to or to detect a touch of the object of the input fields (29) projected onto the projection surface (28) in order to recognize an input into the input device (61) associated with the corresponding input field (29). Household appliance after Claim 1 , characterized in that the input device (61) comprises a housing (62) in which the projection device and the sensor device (74) are fastened to the housing (61), and / or that the sensor device (74) proximity sensors (75), in particular Includes infrared proximity sensors. Household appliance after Claim 1 or 2 , characterized by an interior (4), a door leaf (20) provided for opening and closing the interior (4), which has an inside (21) facing the interior (4) and an outside (22) facing away from the interior (4) , and a recessed grip (23) arranged in the outside (22) of the door leaf (20), which comprises a handle (24) which forms an undercut with respect to the outside (22) of the door leaf (20), and the input device (61) is at least partially arranged in the handle (24). Household appliance after Claim 2 and 3 , characterized in that - the door leaf (20) in the region of the handle (24) comprises a pocket (30) which is in particular designed as a backing part and in which the housing (61) with the projection device and sensor device (74) fastened therein is fastened - the housing (62) comprises an opening which is closed with a housing cover (62a), and / or - the housing (62) has a first housing region (63) forming the undercut and a first housing region (63) following the first housing region (63), comprises a second housing area (64) arranged within the door leaf (20), which in particular has a greater depth than the first housing area (63). Household appliance after Claim 3 or 4 , characterized in that the recessed grip (23) has a recess (25) which the handle (24) only partially overlaps and which comprises an outwardly directed surface. Household appliance after Claim 5 , characterized in that the door leaf (20) comprises a cover (26) which covers the depression (25) and forms the projection surface (28) with its outwardly facing surface (27). Household appliance according to one of the Claims 1 to 6 , characterized in that the projection device is designed as a slide projector, in particular a light source (68), a collimation lens (65) following the light source (68), which converts the light generated by the light source (68) into a parallel beam of rays , a slide (66) following the collimation lens (65), through which the beam of rays can pass, and a projection lens (67) following the slide (66) for generating a projection beam from the beam of rays that has passed through the slide (66). Household appliance after Claim 4 and 7 , characterized in that the light source (68), the slide (66), the collimation lens (65) are arranged within the second housing region (64), and the projection lens (67) is arranged within the first housing region (63). Household appliance after Claim 8 , characterized in that the slide projector comprises a deflection mirror (72) following the projection lens (67), which deflects the direction of the projection beam in the direction of the projection surface (28). Household appliance according to one of the Claims 7 to 9 , characterized in that the slide projector comprises a plurality of partial slide projectors (91) arranged next to one another, each having a collimation lens (65), a slide lens (66) following the corresponding collimation lens (65), and a projection lens (67) following the corresponding slide lens (66) ), and the partial slide projectors (91) each project one of the input fields (29) onto the projection surfaces (28). Method for mounting a household appliance in particular according to one of the Claims 1 to 10 which has an interior (4), a door leaf (20) provided for opening and closing the interior (4), which has an inside (21) facing the interior (4) and an outside (22) facing away from the interior (4), and a recessed grip (23) arranged in the outside (22) of the door leaf (20), which comprises a handle (24) which forms an undercut with respect to the outside (22) of the door leaf (20), the door leaf (20) in the region of the handle (23) comprises a pocket (30), which is designed in particular as a backing part, and the recessed grip (23) has a recess (25) which the handle (24) only partially overlaps, and the household appliance comprises an input device (61), a projection device which is set up to project a plurality of input fields (29) onto a projection surface (28), and comprises a sensor device (74) which is set up to detect an approach of an object to or a touch of the object of the input fields (29) projected onto the projection surface (28) in order to input into the input device associated with the corresponding input field (29) (61), the input device (61) comprises a housing (62) within which the projection device and the sensor device (74) are fastened to the housing (62), comprising the following steps for mounting the household appliance: - Pushing the housing (62 ) with the projection device and sensor device (74) fastened therein into the pocket (30), and - fastening a cover (26) in the recessed grip e (23) to cover the recess (25), the outwardly facing surface (27) of the cover (26) forming the projection surface.

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